From PPilgrim@Teleglobe.CATue Jun 13 10:38:14 1995 Date: 13 JUN 95 07:28:42 EDT From: PPilgrim@Teleglobe.CA To: electronica@andrew.cmu.edu Subject: re: Delta Forwarded to: INTERNET [electronica@andrew.cmu.edu] cc: Comments by: Philip Pilgrim@PENNANT POINT@OPS Comments: I thought someone else may like this info too. -------------------------- [Original Message] ------------------------- Matt The Korg delta is a poor replacement for a PPG. It is more of a string machine than a synth. I bought mine used in 1984 for $500 but now I would only pay $100. The main problem with the Delta is that all polyphonic voices seem to share one envelope. This results in the loss of decaying notes when new ones are played. It is like a monophonic in this respect. This effect can be used creatively but one quickly tires of it. The roland RS-09 string/organ has this same economy. The synth section was the weakest point of my synth for 8 years until I removed the rubber stoppers on the top and tweaked the trimmer pots underneath. Boy can that filter self oscillate now! It was the whimpiest filter before hand. Now it sends children running! I use the synth section only for percussive sounds. Interfacing is also a weak point. It complies to the non-Roland Hz/V ratio. Also you have to get schematics to add an external CV in (the gate is there already. It is called trigger in) A trigger out is also present. The synth architecture is straight forward: VC0>VCF>VCA | | LF0 The LFO is only Sine The VCF has Freq, Res, +/- slope knob with env mod amount The VCO has 4 frequency multipliers so it has 5 sliders from 32' to 2' I think that the VCO is only square wave. A noise slider is also provided Envelope is ADSR I would recommend a Yamaha CS-50 or 60. They are heavy but inexpensive. They also have a ring modulator and true polyphonics. I just picked up a Jupiter 4. It is wonderful too and cheap. I hope this helps. I'm still up for more questions too. Philip