Just tried on my own Indigo and couldn't replicate the issue. Enabling both oscillators makes it sound phasey, not volume modulated, which figures given they're both the same waveshapes as opposed to inverse waveforms.
Unsure at this point what it could be.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?  A ribbon-controller or XY-Pad might be nice, too, please! Thanks!
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