http://www.muffwiggler.com/forum/viewtopic.php?p=678089#678089
Posted: Sun Jan 15, 2012 20:01 Post subject: Reply with quote Add User to Ignore List More Tricks and Techniques for the XMIX.
1. Synching LFO reset to keyboard gate signal. The synch input on a sawtooth core oscillator is a little cap that goes to the 5 volt peak reference. A negative going spike on this forces an early reset to zero and restarts the VCO(LFO).
What we need is a device that gives both positive and negative versions of a GATE signal. Such as plugging the GATE signal into the Expand input on an XMIX. Take the plus XMIX output to the envelope generator and the negative XMIX output to the "Synch" input on the LFO.
2. Logic ORing of gate signals: Take one gate to the "Expand" input and one gate to the "X" input. Set "Z" to max set X control to max. XMIX plus output is logic OR of gate signals.
3. Logic "ANDing" of Gate signals: Take Gate one to "X" input of XMIX set X to max. Take Gate two (keyboard) to ZMOD input of XMIX, set ZMOD to max. Set "Z" as needed for effect. XMIX plus output will be high only if both Gate one and Gate two are high.
4. Pulse Roll generation: Sometimes what you want is a repeated set of pulses when a keyboard key is held down. Sometimes called an "Auto" mode this allows strums and rolls (for Marimba maybe). With an Envelator set to "Cycle" mode, the high time of the SQR output is set by the A control and the off time is set by the D control. Using the Patch #3 with a repeating set of pulses sets as Gate one (X) allows the keyboard to gate on and off a repeated set of pulses like a marimba roll.
5. Pulse Burst Generation: If Patch 3 is used with the SQR outputs of two Evelators, the "ON" time of the Envelator into ZMOD will give bursts of pulses from the Envelator connected to the X input at the XMIX plus output.
6. ADSR Envelope summing: As Ralph Burnham's pointed out in Elecronotes Magazine an ADSR is only the mixture of an AD unit with an AR unit. Take two Envelators, set the first to AD set the second to AR. Run keyboard Trigger into AD section Gate in, run keyboard Gate signal into AR section Gate in. Run AD Envelator plus output to X input of XMIX and X control to max, run AR Envelator section into Y input of XMIX, set Y polarity to plus and Y control to max. The ADSR envelope is available at the XMIX plus output with the XMIX "Z" control acting like the old "Sustain" control. The "ZMOD" input can be used as voltage controlled sustain level input.
Have Fun!