Multi-CD sort logic

[kvik2]

I thought that perhaps the issue was related to boxsets with 10 or more CDs, however it seems to be persistent with all boxsets, first all track no. 1 are (dis)played, then track no. 2, etc.

For a 20-CD boxset same sort logic (see below), and as mentioned same UI (dis)play order (all ones, all twos, all threes, etc)

Code:

pi@moode:~ $ ls -1 /var/lib/mpd/music/USB/Transcend/"iTunes AIFF"/"Paul Tortelier"/"Paul Tortelier - The Great EMI Recordings"
1-01 Bach_ Cello Suite #1 In G, BWV 1007 - Praeludium.aif
1-02 Bach_ Cello Suite #1 In G, BWV 1007 - Allemande.aif
1-03 Bach_ Cello Suite #1 In G, BWV 1007 - Courante.aif
1-04 Bach_ Cello Suite #1 In G, BWV 1007 - Sarabande.aif
1-05 Bach_ Cello Suite #1 In G, BWV 1007 - Menuet #1.aif
1-06 Bach_ Cello Suite #1 In G, BWV 1007 - Menuet #2.aif
1-07 Bach_ Cello Suite #1 In G, BWV 1007 - Gigue.aif
1-08 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Praeludium.aif
1-09 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Allemande.aif
1-10 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Courante.aif
1-11 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Sarabande.aif
1-12 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Bourr??e #1.aif
1-13 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Bourr??e #2.aif
1-14 Bach_ Cello Suite #4 In E Flat, BWV 1010 - Gigue.aif
1-15 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Prelude.aif
1-16 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Allemande.aif
1-17 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Courante.aif
1-18 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Sarabande.aif
1-19 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Gavotte #1.aif
1-20 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Gavotte #2.aif
1-21 Bach_ Cello Suite #5 In C Minor, BWV 1011 - Gigue.aif
10-01 Beethoven_ Cello Sonata #1 In F, Op. 5_1 - 1. Adagio Sostenuto, Allegro.aif
10-02 Beethoven_ Cello Sonata #1 In F, Op. 5_1 - 2. Rondo_ Allegro Vivace.aif
10-03 Beethoven_ Cello Sonata #2 In G Minor, Op. 5_2 - 1. Adagio Sostneuto E Espressivo.aif
10-04 Beethoven_ Cello Sonata #2 In G Minor, Op. 5_2 - 2. Allegro Molto Pi?? Tosto Presto.aif
10-05 Beethoven_ Cello Sonata #2 In G Minor, Op. 5_2 - 3. Rondo_ Allegro.aif
10-06 Beethoven_ Cello Sonata #3 In A, Op. 69 - 1. Allegro Ma Non Tanto.aif
10-07 Beethoven_ Cello Sonata #3 In A, Op. 69 - 2. Scherzo_ Allegro Molto.aif
10-08 Beethoven_ Cello Sonata #3 In A, Op. 69 - 3. Adagio Cantibile, Allegro Vivace.aif
11-01 Beethoven_ Cello Sonata #4 In C, Op. 5_4 - 1. Andante, Allegro Vivace.aif
11-02 Beethoven_ Cello Sonata #4 In C, Op. 5_4 - 2. Adagio, Allegro Vivace.aif
11-03 Beethoven_ Cello Sonata #5 In D, Op. 102_2 - 1. Allegro Con Brio.aif
11-04 Beethoven_ Cello Sonata #5 In D, Op. 102_2 - 2. Adagio Con Molto Sentimento D'Affeto.aif
11-05 Beethoven_ Cello Sonata #5 In D, Op. 102_2 - 3. Allegro Fugato.aif
11-06 Beethoven_ Variations On _See The Conqu'ring Hero Comes_, WoO 45.aif
11-07 Beethoven_ Variations On Mozart's _Bei M??nnern_, WoO 46.aif
11-08 Beethoven_ Variations On _Ein M??dchen Oder Weibchen_, Op. 66.aif
12-01 Mendelssohn_ Piano Trio No.1 In D Minor Op.49 - I. Molto Allegro Ed Agitato.aif
12-02 Mendelssohn_ Piano Trio No.1 In D Minor Op.49 - II. Andante Con Moto Tranquillo.aif
12-03 Mendelssohn_ Piano Trio No.1 In D Minor Op.49 - III. Scherzo_ Leggiero E Vivace.aif
12-04 Mendelssohn_ Piano Trio No.1 In D Minor Op.49 - IV. Finale_ Allegro Assai Appassionato.aif
12-05 Schumann_ Piano Trio No.1 In D Minor Op.63 - I. Mit Energie Und Leidenschaft.aif
12-06 Schumann_ Piano Trio No.1 In D Minor Op.63 - II. Lebhaft, Doch Nicht Zu Rasch.aif
12-07 Schumann_ Piano Trio No.1 In D Minor Op.63 - III. Langsam, Mit Inniger Emphindung-.aif
12-08 Schumann_ Piano Trio No.1 In D Minor Op.63 - IV. Mit Feuer.aif
12-09 Mendelssohn_ Chant Populaire.aif
12-10 Weber_ Adagio And Rondo.aif
13-01 Ravel_ Piano Trio In A Minor - I. Mod??r??.aif
13-02 Ravel_ Piano Trio In A Minor - II. Pantoum_ Assez Vif.aif
13-03 Ravel_ Piano Trio In A Minor - III. Passacaille_ Tr??s Large-.aif
13-04 Ravel_ Piano Trio In A Minor - IV. Final_ Anim??.aif
13-05 Saint-Sa??ns_ Piano Trio In F Op.18 - I. Allegro Vivace.aif
13-06 Saint-Sa??ns_ Piano Trio In F Op.18 - II. Andante.aif
13-07 Saint-Sa??ns_ Piano Trio In F Op.18 - III. Scherzo_ Presto.aif
13-08 Saint-Sa??ns_ Piano Trio In F Op.18 - IV. Allegro.aif
13-09 Saint-Sa??ns_ Cello Sonata No.1 In C Minor Op.32 - I. Allegro.aif
13-10 Saint-Sa??ns_ Cello Sonata No.1 In C Minor Op.32 - II. Andante Tranquille Sostenuto.aif
13-11 Saint-Sa??ns_ Cello Sonata No.1 In C Minor Op.32 - III. Allegro Moderato.aif
14-01 Brahms_ Cello Sonata In E Minor No.1 Op.38 - I. Allegro Non Troppo.aif
14-02 Brahms_ Cello Sonata In E Minor No.1 Op.38 - II. Allegretto Quasi Menuetto.aif
14-03 Brahms_ Cello Sonata In E Minor No.1 Op.38 - III. Allegro.aif
14-04 Brahms_ Cello Sonata In F No.2 Op.99 - I. Allegro Vivace.aif
14-05 Brahms_ Cello Sonata In F No.2 Op.99 - II. Adagio Affettuoso.aif
14-06 Brahms_ Cello Sonata In F No.2 Op.99 - III. Allegro Passionato.aif
14-07 Brahms_ Cello Sonata In F No.2 Op.99 - IV. Allegro Molto.aif
14-08 Schubert_ Sonata In A Minor D821 'Arpeggione' - I. Allegro Moderato.aif
14-09 Schubert_ Sonata In A Minor D821 'Arpeggione' - II. Adagio.aif
14-10 Schubert_ Sonata In A Minor D821 'Arpeggione' - III. Allegretto.aif
15-01 Chopin_ Cello Sonata in G minor, Op. 65_ 1. Allegro moderato.aif
15-02 Chopin_ Cello Sonata in G minor, Op. 65_ 2. Scherzo.aif
15-03 Chopin_ Cello Sonata in G minor, Op. 65_ 3. Largo.aif
15-04 Chopin_ Cello Sonata in G minor, Op. 65_ 4. Allegro.aif
15-05 Rachmaninov_ Cello Sonata in G minor, Op. 19_ 1. Lento, Allegro moderato.aif
15-06 Rachmaninov_ Cello Sonata in G minor, Op. 19_ 2. Allegro scherzando.aif
15-07 Rachmaninov_ Cello Sonata in G minor, Op. 19_ 3. Andante.aif
15-08 Rachmaninov_ Cello Sonata in G minor, Op. 19_ 4. Allegro mosso.aif
15-09 Faur??_ Cello Sonata #2 in G minor, Op. 117_ 1. Allegro.aif
15-10 Faur??_ Cello Sonata #2 in G minor, Op. 117_ 2. Andante.aif
15-11 Faur??_ Cello Sonata #2 in G minor, Op. 117_ 3. Final; Allegro vivo.aif
16-01 Mendelssohn_ Cello Sonata #1 In B Flat, Op. 45 - 1. Allegro Vivace.aif
16-02 Mendelssohn_ Cello Sonata #1 In B Flat, Op. 45 - 2. Andante.aif
16-03 Mendelssohn_ Cello Sonata #1 In B Flat, Op. 45 - 3. Allegro Assai.aif
16-04 Mendelssohn_ Cello Sonata #2 In D, Op. 58 - 1. Allegro Assai Vivace.aif
16-05 Mendelssohn_ Cello Sonata #2 In D, Op. 58 - 2. Allegretto Scherzando.aif
16-06 Mendelssohn_ Cello Sonata #2 In D, Op. 58 - 3. Adagio.aif
16-07 Mendelssohn_ Cello Sonata #2 In D, Op. 58 - 4. Molto Allegro E Vivace.aif
16-08 Faur??_ Cello Sonata #1 In D Minor, Op. 109 - 1. Allegro.aif
16-09 Faur??_ Cello Sonata #1 In D Minor, Op. 109 - 2. Andante.aif
16-10 Faur??_ Cello Sonata #1 In D Minor, Op. 109 - 3. Allegro Commodo.aif
17-01 Kod??ly_ Sonata Op.8 For Solo Cello - I. Allegro Moestoso Ma Appassionato.aif
17-02 Kod??ly_ Sonata Op.8 For Solo Cello - II. Adagio(Con Grand' Espressione).aif
17-03 Kod??ly_ Sonata Op.8 For Solo Cello - III. Allegro Molto Vivace.aif
17-04 Tortelier_ Suite In D Minor For Solo Cello - I. Pr??lude(Maestoso).aif
17-05 Tortelier_ Suite In D Minor For Solo Cello - II. Allemande.aif
17-06 Tortelier_ Suite In D Minor For Solo Cello - III. Courante(Vivo E Leggiero).aif
17-07 Tortelier_ Suite In D Minor For Solo Cello - IV. Sarabande(Adagio).aif
17-08 Tortelier_ Suite In D Minor For Solo Cello - V. Bourr??e(Moderato).aif
17-09 Tortelier_ Suite In D Minor For Solo Cello - VI. Gigue(Molto Risoluto).aif
17-10 Tcherepnin_ Piano Trio Op.34 - I. Moderato tranquillo-Allegro.aif
17-11 Tcherepnin_ Piano Trio Op.34 - II. Allegretto.aif
17-12 Tcherepnin_ Piano Trio Op.34 - III. Allegro molto-Allegro Risoluto.aif
17-13 Tcherepnin_ Duo Op.49 For Violin And Cello - I. Allegro.aif
17-14 Tcherepnin_ Duo Op.49 For Violin And Cello - II. Maestoso-Allegretto.aif
17-15 Tcherepnin_ Duo Op.49 For Violin And Cello - III. Moderato.aif
17-16 Tcherepnin_ Duo Op.49 For Violin And Cello - IV. Allegro.aif
17-17 Tcherepnin_ Duo Op.49 For Violin And Cello - V. Allegro Moderato.aif
17-18 Tcherepnin_ Suite Op.76 For Solo Cello - I. Quasi Cadenza-.aif
17-19 Tcherepnin_ Suite Op.76 For Solo Cello - II. Tempo Risoluto-.aif
17-20 Tcherepnin_ Suite Op.76 For Solo Cello - III. Largo-.aif
17-21 Tcherepnin_ Suite Op.76 For Solo Cello - IV. Vavace.aif
18-01 Grieg_ Cello Sonata in A minor, Op.36 - I. Allegro agitato.aif
18-02 Grieg_ Cello Sonata in A minor, Op.36 - II. Andante.aif
18-03 Grieg_ Cello Sonata in A minor, Op.36 - III. Allegro.aif
18-04 Chopin_ Introduction And Polonaise Brilliante, Op.36.aif
18-05 Chopin_ Prelude In E Minor, Op.28 No.4.aif
18-06 Dvo????k_ Rondo In G Minor, Op.94.aif
18-07 Popper_ Dance Of The Elves, Op.39.aif
18-08 Rimsky-Korsakov_ Fight Of The Bumblebee (From The Tale Of Tsar Saltan).aif
18-09 Rachmaninov_ Vocalise, Op.34 No.14.aif
18-10 Karjinsky_ Esquisse.aif
18-11 Schubert_ Die Biene, Op.13 No.9.aif
18-12 Paganini_ Moto Perpetuo, Op.11.aif
18-13 Valentini_ Cello Sonata In E - Grave. Allegro.aif
18-14 Bach_ Toccata, Adagio & Fugue In C, BWV 564 - Adagio.aif
19-01 Saint-Sa??ns_ Le Cygne.aif
19-02 Saint-Sa??ns_ Allegro Appassionato Op.43.aif
19-03 Saint-Sa??ns_ Serenade Op.16.aif
19-04 Saint-Sa??ns_ 'Mon Cour S'ouvre A Ta Voix.aif
19-05 Saint-Sa??ns_ Dance Of The Preiestesses Of Dagon.aif
19-06 Saint-Sa??ns_ Violin Concerto No.3-Andantino.aif
19-07 Saint-Sa??ns_ Pavane.aif
19-08 Saint-Sa??ns_ Les Cloches Du Soir.aif
19-09 Massenet_ Elegie.aif
19-10 Faur??_ Apres Un Reve.aif
19-11 Faur??_ Elegie.aif
19-12 Faur??_ Papillon.aif
19-13 Faur??_ Serenade.aif
19-14 Faur??_ Sicilienne.aif
19-15 Debussy_ Minstrels.aif
19-16 Hekking_ Villageoise.aif
19-17 Ravel_ Piece En Forme D'Habanera.aif
19-18 Sarasate_ Zapateado Op 23, No2.aif
19-19 Granados_ Intermezzo.aif
19-20 Nin_ Granadina.aif
19-21 Tortelier_ Pishnetto.aif
19-22 Tortelier_ Three Miniatures.aif
19-23 Tortelier_ Three Miniatures.aif
19-24 Tortelier_ Three Miniatures.aif
19-25 Tortelier_ Valse No.1'Alla Maud'.aif
2-01 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Praeludium.aif
2-02 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Allemande.aif
2-03 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Courante.aif
2-04 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Sarabande.aif
2-05 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Menuet #1.aif
2-06 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Menuet #2.aif
2-07 Bach_ Cello Suite #2 In D Minor, BWV 1008 - Gigue.aif
2-08 Bach_ Cello Suite #3 In C, BWV 1009 - Praeludium.aif
2-09 Bach_ Cello Suite #3 In C, BWV 1009 - Allemande.aif
2-10 Bach_ Cello Suite #3 In C, BWV 1009 - Courante.aif
2-11 Bach_ Cello Suite #3 In C, BWV 1009 - Sarabande.aif
2-12 Bach_ Cello Suite #3 In C, BWV 1009 - Bourr??e #1.aif
2-13 Bach_ Cello Suite #3 In C, BWV 1009 - Bourr??e #2.aif
2-14 Bach_ Cello Suite #3 In C, BWV 1009 - Gigue.aif
2-15 Bach_ Cello Suite #6 In D, BWV 1012 - Prelude.aif
2-16 Bach_ Cello Suite #6 In D, BWV 1012 - Allemande.aif
2-17 Bach_ Cello Suite #6 In D, BWV 1012 - Courante.aif
2-18 Bach_ Cello Suite #6 In D, BWV 1012 - Sarabande.aif
2-19 Bach_ Cello Suite #6 In D, BWV 1012 - Gavotte #1.aif
2-20 Bach_ Cello Suite #6 In D, BWV 1012 - Gavotte #2.aif
2-21 Bach_ Cello Suite #6 In D, BWV 1012 - Gigue.aif
20-01 Frescobaldi_ Toccata (arr. Gaspar Cassado).aif
20-02 Couperin_ Air & Chaconne (Concert For Two Cellos) (arr. Paul Bazelaire).aif
20-03 Giradini_ Tamborino For Two Cellos.aif
20-04 Schumann_ Tr??umerei (from Kinderszenen, arr. for cello).aif
20-05 Cui_ Orientale (from Kaleidoscope).aif
20-06 Popper_ Gavotte for Two Cellos, Op.16.aif
20-07 Prokofiev_ March (from Music For Children, Op.65).aif
20-08 Tortelier_ Duos 'Chameau-Loutres' for Two Cellos - M??dina-Bis De Basset-Bis De Loutres.aif
20-09 Tortelier_ Toccata (from Caprice #3).aif
20-10 Honegger_ Cello Concerto - I. Andante.aif
20-11 Honegger_ Cello Concerto - II. Lento.aif
20-12 Honegger_ Cello Concerto - III. Allegro Marcato.aif
20-13 Debussy_ Cello Sonata In D Minor - I. Prologue_ Lent.aif
20-14 Debussy_ Cello Sonata In D Minor - II. S??r??nade_ Mod??r??ment Anim??.aif
20-15 Debussy_ Cello Sonata In D Minor - III. Finale_ Anim??.aif
20-16 Tortelier_ Burlesque_ 'Le Pitre'.aif
20-17 Bach_ Prelude in Eb minor (from The Well-Tempered Clavier, Book 1).aif
3-01 Vivaldi_ Cello Concerto In C, RV 400 - 1. Allegro.aif
3-02 Vivaldi_ Cello Concerto In C, RV 400 - 2. Largo.aif
3-03 Vivaldi_ Cello Concert in C, RV400 - Allegro non molto.aif
3-04 Vivaldi_ Cello Concerto In B Minor, RV 424 - 1. Allegro Non Molto.aif
3-05 Vivaldi_ Cello Concerto In B Minor, RV 424 - 2. Largo.aif
3-06 Vivaldi_ Cello Concert in B minor, RV424 - 3. Allegro.aif
3-07 Vivaldi_ Cello Concert in C minor, RV401 - 1. Allegro non molto (Andante poco mosso).aif
3-08 Vivaldi_ Cello Concert in C minor, RV401 - 2. Adagio.aif
3-09 Vivaldi_ Cello Concert in C minor, RV401 - 3. Allegro ma non molto.aif
3-10 Vivaldi_ Concert for 2 Cello in G minor, RV531 - 1. Allegro.aif
3-11 Vivaldi_ Concert for 2 Cello in G minor, RV531 - 2. Largo.aif
3-12 Vivaldi_ Concert for 2 Cello in G minor, RV531 - 3. Allegro.aif
3-13 Vivaldi_ Concerto In C For Violin & 2 Cellos, RV 561 - 1. Allegro.aif
3-14 Vivaldi_ Concert for 2 Cello in C, RV561 - 2. Largo.aif
3-15 Vivaldi_ Concert for 2 Cello in C, RV561 - 3. Allegro (molto).aif
3-16 Vivaldi_ Cello Concert in D, RV230 - 1. Allegro.aif
3-17 Vivaldi_ Cello Concert in D, RV230 - 2. Larghetto.aif
3-18 Vivaldi_ Cello Concert in D, RV230 - 3. Allegro.aif
3-19 H??ndel_ Trio Sonata in G minor - 1. Grave (arr. for 2 cello & Orch.).aif
3-20 H??ndel_ Trio Sonata in G minor - 2. Allegro - (arr. for 2 cello & Orch.).aif
3-21 H??ndel_ Trio Sonata in G minor - 3. Largo - (arr. for 2 cello & Orch.).aif
3-22 H??ndel_ Trio Sonata in G minor - 4. Fugue (arr. for 2 cello & Orch.).aif
4-01 Haydn_ Cello Concerto In C Major, Hob. VIIb_1 - I. Moderato.aif
4-02 Haydn_ Cello Concerto In C Major, Hob. VIIb_1 - II. Adagio.aif
4-03 Haydn_ Cello Concerto In C Major, Hob. VIIb_1 - III. Allegro Molto.aif
4-04 Haydn_ Cello Concerto In D Major, Hob. VIIb_2 - I. Allegro Moderato.aif
4-05 Haydn_ Cello Concerto In D Major, Hob. VIIb_2 - II. Adagio.aif
4-06 Haydn_ Cello Concerto In D Major, Hob. VIIb_2 - III. Allegro.aif
4-07 Boccherini_ Cello Concerto in B flat major, G482 - I. Allegro Moderato.aif
4-08 Boccherini_ Cello Concerto in B flat major, G482 - II. Adagio.aif
4-09 Boccherini_ Cello Concerto in B flat major, G482 - III. Rondo (Allegro).aif
5-01 Schumann_ Cello Concerto in A minor, Op.129 - I. Nicht schnell -.aif
5-02 Schumann_ Cello Concerto in A minor, Op.129 - II. Langsam -.aif
5-03 Schumann_ Cello Concerto in A minor, Op.129 - III. Sehr lebhaft.aif
5-04 Bruch_ Kol Nidrei, Op.47.aif
5-05 Brahms_ Double Concerto in A minor, Op.102 - I. Allegro.aif
5-06 Brahms_ Double Concerto in A minor, Op.102 - II. Andante.aif
5-07 Brahms_ Double Concerto in A minor, Op.102 - III. Vivace non troppo.aif
5-08 Paganini_ 'Dal Tuo Stellato Soglio' variations.aif
6-01 Dvo????k_ Cello Concerto In B Minor, Op. 104 - 1. Allegro.aif
6-02 Dvo????k_ Cello Concerto In B Minor, Op. 104 - 2. Adagio, Ma Non Troppo.aif
6-03 Dvo????k_ Cello Concerto In B Minor, Op. 104 - 3. Finale_ Allegro Moderato.aif
6-04 Dvo????k_ Rondo in G minor, Op.94.aif
6-05 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Introduction, Theme & Var. #1.aif
6-06 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #2.aif
6-07 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #3.aif
6-08 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #4.aif
6-09 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #5.aif
6-10 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #6.aif
6-11 Tchaikovsky_ Variations On A Rococo Theme, Op. 33 - Var. #7.aif
6-12 Tchaikovsky_ Pezzo capriccioso, Op.62.aif
7-01 Lalo_ Cello Concerto In D Minor - 1. Prelude_ Lento, Allegro Maestoso.aif
7-02 Lalo_ Cello Concerto In D Minor - 2. Intermezzo.aif
7-03 Lalo_ Cello Concerto In D Minor - 3. Introduction_ Andante, Allegro Vivace.aif
7-04 Saint-Sa??ns_Cello Concerto No.1 - 1. Allegro Non Troppo.aif
7-05 Saint-Sa??ns_Cello Concerto No.1 - 2. Allegrettto Con Moto.aif
7-06 Saint-Sa??ns_Cello Concerto No.1 - 3. Un Peu Moins Vite.aif
7-07 Saint-Sa??ns_ Allegro Appassionato In B Minor, Op. 43.aif
7-08 Saint-Sa??ns_ Le Cygne.aif
7-09 Faur??_ ??l??gie in C minor, Op.24.aif
7-10 Bo??llmann_ Symphonic Variations, Op.23 - Moderato maestoso -.aif
7-11 Bo??llmann_ Symphonic Variations, Op.23 - A tempo andantino -.aif
7-12 Bo??llmann_ Symphonic Variations, Op.23 - Un peu plus vite.aif
8-01 Elgar_ Cello Concerto In E Minor, Op. 85 - 1. Adagio-Moderato-.aif
8-02 Elgar_ Cello Concerto in E minor, Op.85 - 2. Lento-Allegro molto.aif
8-03 Elgar_ Cello Concerto In E Minor, Op. 85 - 3. Adagio-.aif
8-04 Elgar_ Cello Concerto in E minor, Op.85 - 4. Allegro-Moderato-Allegro ma non troppo.aif
8-05 Walton_ Cello Concerto - I. Moderato.aif
8-06 Walton_ Cello Concerto - II. Allegro appassionato.aif
8-07 Walton_ Cello Concerto - III. Lento-Allegro molto.aif
8-08 Delius_ Double Concerto for violin, cello and orchestra - Quietly-.aif
8-09 Delius_ Double Concerto for violin, cello and orchestra - With moderate speed-.aif
8-10 Delius_ Double Concerto for violin, cello and orchestra - Molto tranquillo.aif
9-01 Strauss (R)_ Don Quixote, Op. 35 - Introduction.aif
9-02 Strauss (R)_ Don Quixote, Op. 35 - Theme_ The Knight Of The Doleful Countenance.aif
9-03 Strauss (R)_ Don Quixote, Op. 35 - Sancho Panza.aif
9-04 Strauss (R)_ Don Quixote, Op. 35 - Var 1_ The Adventure Of The Windmills.aif
9-05 Strauss (R)_ Don Quixote, Op. 35 - Var 2_ The Battle With The Sheep.aif
9-06 Strauss (R)_ Don Quixote, Op. 35 - Var 3_ Dialogue Of Knight & Squire.aif
9-07 Strauss (R)_ Don Quixote, Op. 35 - Var 4_ The Adventure With The Procession Of Penitents.aif
9-08 Strauss (R)_ Don Quixote, Op. 35 - Var 5_ Don Quixote's Vigil.aif
9-09 Strauss (R)_ Don Quixote, Op. 35 - Var 6_ Dulcinea's Enchantment.aif
9-10 Strauss (R)_ Don Quixote, Op. 35 - Var 7_ The Ride Through The Air.aif
9-11 Strauss (R)_ Don Quixote, Op. 35 - Var 8_ The Adventure Of The Enchanted Boat.aif
9-12 Strauss (R)_ Don Quixote, Op. 35 - Var 9_ The Contest With The Magicians.aif
9-13 Strauss (R)_ Don Quixote, Op. 35 - Var 10_ Joust With Knight Of White Moone.aif
9-14 Strauss (R)_ Don Quixote, Op. 35 - Finale (Sehr ruhig).aif
9-15 Shostakovich_ Cello Concerto No. 1 in E-Flat, Op.107 - I. Allegretto.aif
9-16 Shostakovich_ Cello Concerto No. 1 in E-Flat, Op.107 - II. Moderato - attacca.aif
9-17 Shostakovich_ Cello Concerto No. 1 in E-Flat, Op.107 - III. Cadenza - attacca.aif
9-18 Shostakovich_ Cello Concerto No. 1 in E-Flat, Op.107 - IV. Allegro con moto.aif
cover.jpg

I did a ls for a boxset with less than 10 CDs (see below), and sort order is correct. However, in web UI they are (dis)played like described above.

Code:

pi@moode:~ $  ls -1 /var/lib/mpd/music/USB/Transcend/"iTunes AIFF"/"Alfred Cortot"/"Alfred Cortot - The Master Pianist"
1-01 Chopin_ Preludes Op. 28 - No. 1 in C (Agitato).aif
1-02 Chopin_ Preludes Op. 28 - No. 2 in A minor (Lento).aif
1-03 Chopin_ Preludes Op. 28 - No. 3 in G (Vivace).aif
1-04 Chopin_ Preludes Op. 28 - No. 4 in E minor (Largo).aif
1-05 Chopin_ Preludes Op. 28 - No. 5 in D (Allegro molto).aif
1-06 Chopin_ Preludes Op. 28 - No. 6 in B minor (Lento assai).aif
1-07 Chopin_ Preludes Op. 28 - No. 7 in A (Andantino).aif
1-08 Chopin_ Preludes Op. 28 - No. 8 in F sharp minor (Molto agitato).aif
1-09 Chopin_ Preludes Op. 28 - No. 9 in E (Largo).aif
1-10 Chopin_ Preludes Op. 28 - No. 10 in C sharp minor (Allegro molto).aif
1-11 Chopin_ Preludes Op. 28 - No. 11 in B (Vivace).aif
1-12 Chopin_ Preludes Op. 28 - No. 12 in G sharp minor.aif
1-13 Chopin_ Preludes Op. 28 - No. 13 in F sharp (Lento).aif
1-14 Chopin_ Preludes Op. 28 - No. 14 in E flat minor (Allegro).aif
1-15 Chopin_ Preludes Op. 28 - No. 15 in D sharp (Sostenuto).aif
1-16 Chopin_ Preludes Op. 28 - No. 16 in B flat minor (Presto con fuoco).aif
1-17 Chopin_ Preludes Op. 28 - No. 17 in A flat (Allegretto).aif
1-18 Chopin_ Preludes Op. 28 - No. 18 in F minor (Allegro molto).aif
1-19 Chopin_ Preludes Op. 28 - No. 19 in E flat (Vivace).aif
1-20 Chopin_ Preludes Op. 28 - No. 20 in C minor (Largo).aif
1-21 Chopin_ Preludes Op. 28 - No. 21 in B flat (Cantabile).aif
1-22 Chopin_ Preludes Op. 28 - No. 22 in G minor (Molto agitato).aif
1-23 Chopin_ Preludes Op. 28 - No. 23 in F (Moderato).aif
1-24 Chopin_ Preludes Op. 28 - No. 24 in D minor (Allegro appassionato).aif
1-25 Chopin_ Prelude in C harp minor Op. 45.aif
1-26 Chopin_ Berceuse in D flat Op. 57.aif
1-27 Chopin_ Impromptu No. 1 in A flat Op. 29.aif
1-28 Chopin_ Impromptu No. 2 in F sharp Op. 36.aif
1-29 Chopin_ Impromptu No. 3 in G flat Op. 51.aif
1-30 Chopin_ Impromptu No. 4 in C sharp minor Op. 66.aif
1-31 Chopin_ Barcarolle in F sharp Op. 60.aif
2-01 Beethoven_ Piano Trio in B flat Op. 97 'Archduke' - I. Allegro moderato.aif
2-02 Beethoven_ Piano Trio in B flat Op. 97 'Archduke' - II. Scherzo_ Allegro - Trio.aif
2-03 Beethoven_ Piano Trio in B flat Op. 97 'Archduke' - III. Andante cantabile.aif
2-04 Beethoven_ Piano Trio in B flat Op. 97 'Archduke' - IV. Allegro moderato.aif
2-05 Schubert_ Piano Trio No.1 in B flat D898 - I. Allegro moderato.aif
2-06 Schubert_ Piano Trio No.1 in B flat D898 - II. Andante un poco mosso.aif
2-07 Schubert_ Piano Trio No.1 in B flat D898 - III. Scherzo_ Allegro - Trio.aif
2-08 Schubert_ Piano Trio No.1 in B flat D898 - IV. Rondo_ Allegro vivace - Presto.aif
2-09 Beethoven_ Seven Variations in E flat on 'Bei M??nnern, welche Liebe f??hlen' from Mozart's 'Die Zauberfl??te'.aif
3-01 Debussy_ Children's Corner - Doctor Gradus Ad Parnassum.aif
3-02 Debussy_ Children's Corner - Jimbo's Lullaby.aif
3-03 Debussy_ Children's Corner - Serenade For The Doll.aif
3-04 Debussy_ Children's Corner - The Snow Is Dancing.aif
3-05 Debussy_ Children's Corner - The Little Shepherd.aif
3-06 Debussy_ Children's Corner - Golliwogg's Cake-Walk.aif
3-07 Debussy_ Pr??ludes - Livre 1 - Danseuses De Delphes.aif
3-08 Debussy_ Pr??ludes - Livre 1 - Voiles.aif
3-09 Debussy_ Pr??ludes - Livre 1 - Le Vent Dans La Plaine.aif
3-10 Debussy_ Pr??ludes - Livre 1 - Les Sons Et Les Parfums Tournent Dans L'air Du Soir.aif
3-11 Debussy_ Pr??ludes - Livre 1 - Les Collines d'Anacapri.aif
3-12 Debussy_ Pr??ludes - Livre 1 - Des Par Sur La Neige.aif
3-13 Debussy_ Pr??ludes - Livre 1 - Ce Qu'a Vu Le Vent D'ouest.aif
3-14 Debussy_ Pr??ludes - Livre 1 - La Fille Aux Cheveux De Lin.aif
3-15 Debussy_ Pr??ludes - Livre 1 - La S??r??nade Interrompue.aif
3-16 Debussy_ Pr??ludes - Livre 1 - La Cath??drale Engloutie.aif
3-17 Debussy_ Pr??ludes - Livre 1 - La Danse De Puck.aif
3-18 Debussy_ Pr??ludes - Livre 1 - Minstrels.aif
3-19 Ravel_ Sonatine - Mod??r??.aif
3-20 Ravel_ Sonatine - Menuet.aif
3-21 Ravel_ Sonatine - Anim??.aif
3-22 Ravel_ Jeux d'eau.aif
4-01 Franck_ Violin Sonata in A - I. Allegretto ben moderato.aif
4-02 Franck_ Violin Sonata in A - II. Allegro.aif
4-03 Franck_ Violin Sonata in A - III. Recitativo_ Ben moderato - Fantasia_ Molto lento.aif
4-04 Franck_ Violin Sonata in A - IV. Allegretto poco mosso.aif
4-05 Debussy_ Violin Sonata - I. Allegro vivo.aif
4-06 Debussy_ Violin Sonata - II. Interm??de_ Fantasque et l??ger.aif
4-07 Debussy_ Violin Sonata - III. Finale_ Tr??s anim??.aif
4-08 Debussy_ Pr??ludes No.12, Livre I - Ministrels.aif
4-09 Faur??_ Violin Sonata No.1 in A Op.13 - I. Allegro molto.aif
4-10 Faur??_ Violin Sonata No.1 in A Op.13 - II. Andante.aif
4-11 Faur??_ Violin Sonata No.1 in A Op.13 - III. Allegro vivo.aif
4-12 Faur??_ Violin Sonata No.1 in A Op.13 - IV. Allegro quasi presto.aif
5-01 Haydn_ Piano Trio in G Op.73 No.2 - I. Andante.aif
5-02 Haydn_ Piano Trio in G Op.73 No.2 -  II. Poco adagio cantabile.aif
5-03 Haydn_ Piano Trio in G Op.73 No.2 - III. Rondo all'ongarese_ Presto.aif
5-04 Beethoven_ Violin Sonata No.9 in A Op.47 'Kreutzer' - I. Adagio Sostenuto - Presto.aif
5-05 Beethoven_ Violin Sonata No.9 in A Op.47 'Kreutzer' - II. Andante con varianzioni 1 - 4.aif
5-06 Beethoven_ Violin Sonata No.9 in A Op.47 'Kreutzer' - III. Finale_ Presto.aif
5-07 Brahms_ Double Concerto in A minor Op.102 - I. Allegro.aif
5-08 Brahms_ Double Concerto in A minor Op.102 - II. Andante.aif
5-09 Brahms_ Double Concerto in A minor Op.102 - III. Vivace ma non tanto.aif
6-01 Mendelssohn_ Piano Trio No.1 in D minor Op.49 - I. Molto allegro ed agitato.aif
6-02 Mendelssohn_ Piano Trio No.1 in D minor Op.49 - II. Andante con moto tranquillo.aif
6-03 Mendelssohn_ Piano Trio No.1 in D minor Op.49 - III. Scherzo (Leggiero e vivace).aif
6-04 Mendelssohn_ Piano Trio No.1 in D minor Op.49 - IV. Finale (Allegro assai appassionato).aif
6-05 Schumann_ Piano Trio in D minor Op.63 - I. Mit Energie und Leidenschaft.aif
6-06 Schumann_ Piano Trio in D minor Op.63 - II. Lebhaft, doch nicht zu rasch.aif
6-07 Schumann_ Piano Trio in D minor Op.63 - III. Langsam, mit inniger Empfindung.aif
6-08 Schumann_ Piano Trio in D minor Op.63 - IV. Mit Feuer.aif
6-09 Beethoven_ 10 Variations in G Op.121a on the song 'Ich bin der Schneider Kakadu' from 'Die Schwestern von Prag' by M??ller.aif
7-01 Liszt_ Piano Sonata in B minor.aif
7-02 Liszt_ Hungarian Rhapsody No.2 in C sharp minor.aif
7-03 Liszt_ Hungarian Rhapsody No.11 in A minor.aif
7-04 Liszt_ Paraphrase on 'Rigoletto' by Verdi.aif
7-05 Liszt_ Two Legends - No.2 'St. Francis de Paule walking on the water'.aif
7-06 Liszt_ Concert Study No.2 'La legierezza'.aif
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You asked for a sort list from another player. Unfortunately, with my limited skills, I'm unable to make a ls via ssh in Volumio 2, the other working player I have. I think I need root access, which apparently is disabled by default, and I haven't find a way around it. As mentioned CD/track order in Volumio 2 works correctly.

I can't really tell, if the sort issue has been present since the start, have been too focussed on learning/trying out/getting things to work. I didn't notice any problems with the initial installation, used the guide by member deztiny (in FAQ and Guides).