Deluxe reverb tremolo lag

[colinesquire]

When I dial up the speed from slow to fast on my 74 dr I get a second or so lag before it kicks in. Any ideas what I should look at? I do have a spare new optocoupler but not sure if that would fix it.

I went through this amp a few months ago and replaced electrolytics but can't remember how it behaved before that. Thanks for any ideas!

 

[slider313]

Change the three ceramic disc oscillating caps in the circuit; .02, .01, .01.