I've been learning to make trance and progressive house for the past few years, and have always encountered the same problem when creating sounds with unison, eg. plucked saw chords.
Every few stabs the voices align in a way that causes resonant peaks at certain frequencies, especially in the low end. I can't seem to correct this with EQ, as the frequency of the peaks vary throughout the part.
To give you an idea of what the effect sounds like, see example below (most noticeable at 5 and 15 seconds):
A workaround I have used is to record the part several times and manually piece together the best bits - but this takes forever, especially in automated sections, and only works for sounds with low polyphony. Is there a synthesis technique I could use to prevent this from happening?
Cheers for any info.