I dug this out of the archives:
I said way back in May sometime:
>>>>>>>
Technically, a lag processor introduces an RC time constant into the input
signal. It is mostly used to process control voltages.
A SIMPLE lag processor would have a single knob to control both rise and
fall time. It might allow voltage control of the rise and fall time also.
A BETTER lag processor would have separate controls and CV inputs for rise
and fall time. Add triggering capability and you have the Serge Universal
Slope Generator, an extremely flexible module which JW described in detail
in a post on 3/7/99.
A STUDLY lag processor has separate rise and fall controls, AND allows you
to vary the response from linear to exponential (as in the Emu design).
Here's a few things you can do with one:
1. Add portamento to any stepped CV as Paul mentioned - sample & hold and
sequencer outputs, for instance.
2. Turn a gate signal into an ASR envelope generator (that's why you want
separate rise and fall times and exponential response ability).
3. Modify LFO waveforms on the fly, similar to the symmetry control planned
for the 320.
4. Use as a crude audio filter. Probably not that effective on VCOs, but it
works well for filtering white and pink noise into darker varieties, and for
making slow random signals even slower.
They are a lot more versatile than you'd think at first glance.
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Of course, the MOTM version will be in the STUDLY category, right Paul?
Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...