I went deep down the rabbit hole with Tri-brato went it was first launched. Here’s what I do:
- Delay CCW
- Depth L = 1**
- Depth C = the de facto Vibrato depth adjustment.
- Depth R = 1**
- Detune Mix, Env Mix, Env Rate = 0
- Detune & Tone = L0 R 0 & Flat.
That way, the middle LFO phase is all that’s active, and you can use Depth C to tame it or exaggerate it.
** I got in the habit of never turning Depth L-C-R to OFF. I got some nasty pops when sweeping the Depths OFF – 100 with an expression pedal.
** Which is a nice way to pan from centered mono to stereo (and back again), with Depth C and Depth L&R mapped in opposite directions.
For a realistic Vibrato, I keep the LFO Rate in an authentic range, around 1.00 – 5.00 Hz. Certainly no higher than 5.50 Hz., but with rotary & synthetic sounds, all bets are off.
With an H90, you could probably achieve similar results to the above by dialing the Program Mix back from 100%. Since Chorus mixes some dry with modulation, and Vibrato does not, that seems like another viable option.