[sdiy] tuning a polysynth (bit one)

[Dave Magnuson]

I don't have any info to offer, but here's some places to look for help:

Crumar Mailing list: 
http://groups.yahoo.com/group/crumar/

A repair shop in NYC that sells manuals: 
http://members.aol.com/DBmElect/crumar.html

An article about the 3 synths in the "Bit" series: 
http://www.sospubs.co.uk/sos/aug98/articles/crumar.html

Unofficial Bit page:
http://www.pierregander.com/bit/


Hope these help!

Dave


At 06:27 PM 2/5/03 -0500, Ugo wrote:
>hi,
>
>i got a crumar bit one off of ebay and i am in need of some assistance.
>
>when i got the synth in, it was horribly out of adjustment. everything
>seemed as if it was set arbitrarily. with some tweeking, i was able to get
>it tuned so i can use it as a mono synth or a poly synth but not both at the
>same time.
>if i get single notes in tune, each added voice goes further out. if i get a
>basic chord seemingly in tune, single notes are awfull.
>
>the second oscillator seems to increase pitch aprox 25 cents with each added
>voice. the first oscillator instead lowers in pitch with each added voice.
>(though not as far as 25 cents.)
>
>the filters are out of adjustment too.
>
>i've never done analog synth adjustments before so this is completely new
>territory for me. i'd have it done by a pro but im having a tough time
>finding one in my area (washington DC metro). so it looks like its up to me
>to attempt this.
>
>im perfectly willing to rent/borrow an oscilloscope and do this myself but i
>could use some pointers on how to start. btw, are there any software
>oscilloscopes that are acurate enough for this?
>
>i've been a professional guitar tech for over 9 years and a synth addict for
>5 years but i've never learned synth repair and i'd certainly like to. this
>seems like the perfect time to start.
>
>can anyone offer me some suggestions, links, resources, advice, etc. on how
>to adjust this synth?
>
>thanks,
>-ugo
>
>

Resonant Frequency:
resfreq at hoohahrecords.com
http://www.hoohahrecords.com/resfreq/index.html