<p dir="ltr">Hi Elain,<br>
It just depends on whether your AR has exponential or linear output. Linear into linear might not sound the way you'd like it.</p>
<br><div class="gmail_quote"><div dir="ltr">On Mon, 20 Mar 2017 16:58 Elain Klopke, <<a href="mailto:functionofform@gmail.com">functionofform@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg">So I'm going to put this can of worms on the table and back off slowly before opening it....<div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Due to various reasons (not the least of which was getting shafted by the person I purchased a large quantity of LDRs from) I'm switching over to an AR envelope generator and VCA combo for keying my notes on the paraphonic synth. <br class="gmail_msg"><br class="gmail_msg">I decided to go with some circuits that I know and have assembled a few times, the AR generator and VCA from Ray Wilson's original Sound Lab mini synth. I'm going to try to trim away the bits of the AR generator that have to do with the triggered mode since these are going to be gated by the key presses only and see if they still work.<br class="gmail_msg"><br class="gmail_msg">Question time: Ray's VCA is a simple half-a-LM13700 with the CV going into the Bias input and the op amp bit doing its amplify-y thing.</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">1) In his notes, Ray talks about the response to the CV being linear. Since I'm just using this to switch the notes to the rest of the synth with a little preset attack and release that shouldn't be a problem, right? It would only do strange things if I tried feeding it an exponential envelope from an external source?</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">2) If I hard-wire the initial gain "knob" to no initial gain, it's going to be silent until the envelope hits it?</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">3) Is there any noticeable difference between an LM13700, NJM13700, and NJM13600 besides the price? Because at 148 chips for a 3-octave keyboard, price is kinda a thing.</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">-Ian</div></div>
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