Thanks. Will do some experimentingahh ok. Well it's not designed as a preamp gain stage, like the drive but without anything in the loop the effect send would act like as another volume control driving the power section. Cranking the master vol to compensate for volume I'd expect would have more of an effect on the breakup you're hearing.
FWIW, I run a volume pedal in the loop which allows the channel masters to be set higher. Kinda the same deal as varying the effects send level. In this case the effects send is at 1pm but that's not as big of an impact compared to where the vol pedal is set. I'm not sure if there is really a "wrong send level" between 9-3pm but playing around with the send level and the master vol to find something you like is probably the right approach.
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