Crumar Musical Instruments User Group.

you are exactly right, margus! In my Orchestrator the chip is a 4727, 
which i think is a cmos counter. Any idea where I can buy one? I have 
struck out so far.

funny thing is I only see 10 of those chips- seems like there should 
be 12.

Thanks for your help!

floyd--- In crumar@yahoogroups.com, "Margus Kliimask" 
<margus.kliimask@m...> wrote:
> I don't know about OTR keyboard (does this stand for Orchestrator? 
which is
> actually Multiman) but in these 'organ-style' keyboards the sound is
> generated by TOS (Top Octave Synthesizer chip which generates all 
12 base
> frequencies) which are then divided down by divider chips for lower 
octaves,
> one for each note (12 altogether). In my Performer this divider 
chip is
> TDA1008, I bet one of your dividers is either dead or 
malfunctioning. You
> can try swapping the C note divider (should be the first one from 
left) with
> another one and see if the dead note moves to another note.
> 
> Cheers,
> Margus
> Service.