No issues for me on 24bit flac or mp3 with the E30, connected to Allo USBridge Sig.
Hardware, software and fixed volume all play without glitches.
EDIT: I should add that I'm using the E30 in 'DAC mode', which disables the E30 volume control and outputs 0dB volume.
Hardware, software and fixed volume all play without glitches.
EDIT: I should add that I'm using the E30 in 'DAC mode', which disables the E30 volume control and outputs 0dB volume.