calling mark h or stephen giles...royal filter

[swt]

Hi!. Finally i have the royal filter working. It didn't have enough gain for my guitar so i increase the 33k resistor to 300k and decrease the 10k to ground to 6k8. I also was considering putting diodes to get a smooth response out of it when triggered to the max. I'm just using the lm 324 section of it to control the leds on a mcmeat pedal, and trying to get it working as a pseudo microsynth filter section. The problem is...the sweep pot doesn't work as it should. I mean...the attack is always fast, and the decay going to the reset position, is controlled by the sweep knob. I know the principle on how this works, by the discharging of the caps, etc, but...i can't find how to add an attack control to make the sweep go slow from start to stop positions. This would be really useful. The way it's now, from start to stop goes always the same way and the release action is controlled by the sweep, something that is useful, but in a different way. so...is there a way to add an attack control, without compromising the rest of the circuit?. Thanks a lot for any replies!!!!

[StephenGiles]

SWT are you working from version 8a dated 10/12/2004? If so you might try say different value pots between the wiper of the start frequency pot and pin 10 of it's buffer. I'm only guessing here of course - any ideas are welcome.
Stephen

[swt]

Thanks stephen!. i'll try that. do you think it will need a cap like most of the attack controls?

[swt]

I've tried the usual pot+cap at the output of the trigger, and it's not working. Also tried it between the transistor and the buffer+caps arrangement, without good results. So i'm trying to understand how this circuit works. The two transistor setup is there to cause a high pulse that makes the transistor tied to the base to conduct from the start point to the base. So this is the place to put an attack knob. A single pot doesn't work, so i'll need something like a 555 with attak release functions. Can i just use the trigger generated by the 2 trannies as a signal generator for the 555, and that output to the base of the gate transistor?. What do you think?