The op-amp was ADA 4841
I fitted the MAYA and it plays music beautifully, but there are problems:
1/ In the MAYA control panel the sample rate is set to 44.1 and cannot be changed to any other sample rate (even if Reaper is set to 48).
2/ This may be the reason why when playing films in Premiere Pro, the sound is too low in pitch as if the 48kHz soundtrack is playing at 44.1?
3/ Music plays fine from My Music, but when I record into and replay sound from Reaper it is very distorted as if two soundcards are competing?