[sdiy] 'reset' for multivibrator LFO?

[Nick Zuccaro]

hey there, i'm working on a few additions to the standard
2-opamp multivibrator LFO circuit, one feature i wanted to add
was a reset (or sync-to-tempo), basically when you hit a
momentary switch the LFO would go to either the high or low
voltage and start to ramp from that point. how i was thinking
about doing it was to connect a point in the loop to ground or
either rail, forcing that node to a certain potential and
letting it run from there. the thing that i'm not sure about is
the integrator, if sudden change in voltage would screw up the
triangle waveform. basically i need to see if the concept will
work and which point is the best to use, somewhere in the
comparator stage or in the integrator stage. 

another mod i was thinking about is 'quantizing' the frequency
into discrete tempo multiples, there would be a pot to set the
tempo and from there switiches to divide/multiply that, e.g. at
a certain tempo the LFO would cycle in 4 bars, 2 bars, 1 bar,
half note, quarter note etc. etc. that shouldn't be too hard to
do, probably by replacing the rate pot with a switched resistor
network to correspond to the frequency multiple and maybe a few
trimmers. should i be worried about temperature stability with
the passives? another way i was thinking of doing this was to
change the cap value or connect some in parallel, which should
change the rate, but it might introduce some noise/weirdness by
swiching it in and out. anyway, just a few ideas to make the LFO
easier to work with when making music that has a defined tempo,
not that there's anything wrong with music without a tempo.. :] 
l8r...Nick

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