[sdiy] sh1000 random note generator help

[Peter Forrest]

Not as weird as the SH-3 / 3A's sample-and-hold, which is very powerful as a 
stand-alone, but ONLY works when the keyboard CV is switched out... so no 
S&H variations of filter cut-off on a melodic line, for example.
Anyone know if there is a technical reason why?
Peter
----- Original Message ----- 
From: "Fredrik Carlqvist" <Fredrik.Carlqvist at iar.se>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, May 02, 2005 11:19 AM
Subject: RE: [sdiy] sh1000 random note generator help


>
>
> Brett,
>
> Yes, the random notes are produced by sampling the noise generator
> output.
>
> Both the noise level pot and the white/pink switch are designed to
> control the random notes. So to get higher notes as well, you might try
> to switch to white noise. Pink noise will give more lower end notes. To
> increase the 'spread', increase the noise level.
>
> The noise generator output of 1Vpp (there's a trimmer for noise level on
> the power PCB) is sent to the noise level pot and pink/white switch. The
> pot wiper goes back to the power board for amplification. It is
> amplified 15 times and then sent to the VCO board S/H for random note
> generation.
>
> So, in short, it sounds like your SH-1000 is in perfect shape! It's a
> darn good/fun instrument and I use it all the time!
>
>
> Fredrik C
>
>
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Brett Maddaford
> Sent: den 28 april 2005 01:06
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] sh1000 random note generator help
>
> Hi All
>
> Well after some luck getting parts and help from people on here and ken
> stone (big thanks to all) I now have an sh1000 making sound!....even the
> case I picked up to replace the damaged one is only 2 serial numbers
> away from the original.....guess they were destined to meet again after
> 30 years in the world ;)
> Anyway everything seems to work fine but the random note generator does
> not seem to throw notes at the higher end, it is 'playing' the synth
> with I guess random notes but they all seem to be on the lower end. Does
> anyone have any ideas on what part may be at fault and worth checking?
> Also I noticed that the random note generator seems to improve a bit if
> the noise level pot is turned up....is the noise source what the random
> generator maybe tracks to produce its notes?
>
> Any help would be great
>
> Thanks
> Brett
>
>
>
>