A discussion on AH awhile back led me to experiment last night with using my MOTM system to simulate Moog "fatness". The MOTM VCOs already have a very musical full sound, but are very precise. You can simulate vintage equipment by programming pitch instability and grit into the MOTM system. Try this for a fun fatness addition to the regular old unison tuned "Dual VCO->VCF->VCA" patch: 1. Run the Random voltage from the MOTM-100 into an extra VCF audio input such as one of the MOTM-410 In jacks. Run the filter output to a MOTM-300 CV input. Crank the filter down very low, no resonance and crack up the 300 CV input to hear the result. You can tame the wildness of the Random voltage if you filter low enough. I fed a little negative CV to my filter to make it filter a little bit lower. The more you filter, the less amplitude the output will have, so you will need to play with the VCO CV amount. Voila, controlled instability! Now add this VCO to a second stable one tuned in unison for some fatness. 2. Add a tiny amount of white noise to the second VCO CV input. It should be almost subliminal. 3. Add a tiny amount of pink noise to CV the VCF that the VCOs are plugged into. Again, it should be almost subliminal. Run your 410 VCO audio inputs above 6 to add some distortion. Note that in order to try all three of the above suggestions simultaneously, you need 2 VCFs - one to filter the Random CV, one to filter the VCOs. You should be able to dirty things up nicely. Play with turning the various CV amounts off to hear the clean versus dirty versions of the same patch. BTW, using a VCF to filter control voltages works great for mangling fast running LFO waveforms also. A VCF won't generally filter a long way into the subaudio range, however. That's why you buy a Lag Processor module later when Paul releases it! My little CV filtering trick as outlined above actually would work better with a lag processor, which is optimized for low frequency control voltage filtering. Moe
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Moog fatness / dirty it up / lag processing
1999-07-24 by Dave Bradley
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