Ok.

Stacatto was being caused by debug printks. I had some #ifdef statements that should have been #if statements. Fixed.

Pops should now have gone away too. I reworked the code so that the volume boost is applied earlier when changing inputs. It is now applied whilst the mixer is muted. But start testing with the volume low anyway

New binary is hijack244-volboost-2.zimage
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Mk2a 60GB Blue. Serial 030102962 sig.mp3: File Format not Valid.