Tone control on BBD delay

[teknoman2]

Currently I am designing a bbd analog delay based on dm-2 and I was thinking adding a tone control.
My thought is that probably the best position to put the high pass filter is after the signal expansion, but I am not 100% sure where should I put it,before or after the mixing stage?
In which place will be more audible differences?
I think there is a high pass filter after the mixing stage with 3.4 Hz cuttoff.
Do you think should I change those values?

[midwayfair]

Look on the aquaboy after the cancel. See all those RC networks? That's a 5-pole filter. You could make one of them variable, but how big an effect do you think it'll have on the overall outcome if you're only varying one of them?

[teknoman2]

Look on the aquaboy after the cancel. See all those RC networks? That's a 5-pole filter. You could make one of them variable, but how big an effect do you think it'll have on the overall outcome if you're only varying one of them?

Probably there won't be any audible difference if I make any of these RC variable.
That's why I was thinking changing the high pass filter on the output buffer section.
It will alter my dry signal also but I think its the most effective way, don't you think?