[sdiy] Re: an OB-8 that thinks it's a glass of orange juice.

[Magnus Danielson]

From: "Jeremiah Pellin" <jpellin at iname.com>
Subject: an OB-8 that thinks it's a glass of orange juice.
Date: Tue, 18 Feb 2003 10:42:16 -0500

> hello
> jeremiah here.

Dear Jeremiah,

> the ob-8 that i'm triing to save is got itself fuct pretty good.
> 
> the owner said he was in the middle of Page 2 editing when his dog unplugged
> the machine.

Page 2 editing isn't very much sensitive than the Page 1.

Did the dog survive the jolt of chewing the powercord?

> it goes down hill from there.

If its down to thinking it's a glass of orange juice it's pretty fucked up
just like Marvin.

> voice 3 (both oscillators aren' t responding)
> 
> whoever he took it to first changed the battery.
> 
> here's what i found so far.
> 
> the thing has no pitch, volume, filter stability.  every time you hit a note
> (same key or not) it sounds different.  in program mode or manual mode it
> makes you think voice 8 is dead when it's really voice three.
> 
> it said it was version B-5 and it will appear to change settings when you go
> from program to program.
> 
> it's all fuct up.
> 
> oh yeah, one last question, i thought ECO 427 says Envelope offsets should
> be calibrated to -0.2560 volts instead of 0.0000 volts, is this correct?

This is correct.

Now, have you tried to run the full trim-procedure and then hit auto-tune?
If a voice has an oscillator severly out of tune, then it is turned out.

If you just hit a key, the key-assignment will round-robin between the voices.
An untrimmed OB8 could then experience different sounds. You can disable all
other voices if you want to make sure it stays the same.

If it still seems fishier than a Babelfish in the ear, then you also might
start to look at the MUXes acting as S/H for CVs to see if that is what made
it go south.

Let us know how it goes.

> thank you for your time.
> 
> and thank you for triing to help me sort this thing out.

Well, to the limit of my abilities...

Cheers,
Magnus