From gstopp@fibermux.comTue Aug  1 15:11:02 1995
Date: Tue, 01 Aug 95 14:55:23 PST
From: gstopp@fibermux.com
To: analogue@hyperreal.com
Subject: Minimoogs are speed sensitive

     Here's a quirk to the Minimoog that I haven't seen on any other 
     synth...
     
     Set the filter pots like this:
     
     CUTOFF......0
     EMPHASIS....halfway up
     AMOUNT......halfway up or more
     ATTACK......0
     DECAY.......1-2 seconds
     SUSTAIN.....0
     
     Set the amplifer pots like this:
     
     ATTACK......0
     DECAY.......max
     SUSTAIN.....0
     
     Turn on the DECAY switch so that notes sustain after key release.
     
     This makes yer normal "|\" downramp envelope. Hit one key, wait a 
     couple seconds, then start hitting the key faster and faster, and the 
     peak of the envelope rises and the filter opens up more and more the 
     faster you trigger the envelope. This makes it "speed sensitive" 
     instead of velocity or pressure sensitive.
     
     Seems like the VCF envelope generator attack logic dumps the same 
     charge on the EG cap regardless of where it is on the decay slope so 
     the attack builds on the previous envelope cycle. It doesn't do this 
     if the attack is anything other than zero, however.
     
     Anyway this suggests a new module which I've never heard of which 
     outputs a slow moving voltage which rises as the incoming trigger 
     speeds up and falls as the incoming trigger slows down. Hmmm what to 
     call it..."trigger rate integrator"? "speed detector"? "F-to-V 
     converter"? Just a thought.