This homemade "AC4" where I've combined the preamps from two different amps has a weird quirk. When the volume knob of the EF86 channel is set over 3/4 a tremolo effect starts to set in as the note fades (sample 1). Sample 2 is playing though channel two (ECC83) at low volume, with the EF86 channel volume set on max. I believe this effect started when I vent from version 1 to v.2. (In v.1 the gain from the EF86 channel was very low, so maybe it "was there" but never showed because it comes with high gain.) This is not a huge problem since there is no reason I need to dime the gain of the EF86 channel, it gets crunchy enough at about 1/2 anyway. But if I can get rid of it, that would be the best.