[sdiy] REDUCING pt2399 delay noise??

[Dan Snazelle]

Building another pt2399 delay (with cv control) and i am using pretty much stock values from the
 REBOTE 2 delay
 (though i have looked at the echobase and the bernardi delay also)

my question is this:

at LONG delay times ( longest with say a 50k or even 100k pot) i start hearing bubbling noises, static, and what almost sounds like oscillations.

is there a way to reduce this? heaver input or output filtering? more bypassing? 
supply voltages?

i don't need  the delay to be TOO long but these sounds start to happen at around 80% on the 50k pot.

thanks




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