[sdiy] voltage reference advice

[Mike Beauchamp]

I'm building 4 VCO's in a single unit and I don't want to use the rail
voltages for the tuning knobs, octave switches and a few other things
(low current stuff).

I know I can use a Zener diode as a simple zener regulator
(http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/zenereg.html#c2),
but I don't know how noisy and stable that is going to be for this
application. I was looking at the LM431 which looks good.. There's
also the REF02 for a fixed +5V. Does anybody have any preferences for
voltage references?

-- 
[mike]