Minitaur set on Note Sync, shouldn't ...

…the audio file then be visually identical throughout, say, 16 bars playing both oscillators. When I record a sequence, these 16 bars look like a spring, you know, it starts fat and gets thinner and then fat again and then thinner. Like two or three times. Isn’t that what a recording would look like with Note Sync off? I just checked the Minitaurs settings and it always starts on On.

I don’t have the listening gear or room to hear the sub bass (recording and sending files to someone else who will mix) so I can only judge with my eyes.

is it possible there is an LFO or non-retriggered envelope in play?

No, the LFO Amt were both on zero. Don’t think there was any envelope re-triggering. Even so, wouldn’t it have been a consistent sound then and not changing with a 30 second, or so, cycle?