[PROBLEM] Noise when playing first track via USB

[33AndAThird]

Whenever I turn on my pre-amp and play the first track there is a short (approx 0.25 secs) blast of noise. It does't occur again when I play other tracks, but if i turn either my PI4 or pre-amp on and off (effectively resetting the connection), it will occur again.

Signal Chain:
Airplay => Moode on RIP4 => USB => Anthem STR PRE => Musical Fidelity M2SI 
The USB implementation on the STR PRE is by XMOS.

This happened on 8.3.9 and I've just updated to 9.0.0 and the problem persists.

Any help is appreciated.