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helpful tips from Matthias: >X-POP3-Rcpt: kflint@rosy.yourwebhost.com >X-Sender: matthias@pop3.bahianet.com.br (Unverified) >Mime-Version: 1.0 >Date: Wed, 24 Mar 1999 17:57:14 -0300 >To: kflint@annihilist.com >From: Matthias Grob <matthias@grob.org> >Subject: Re: Custom Echoplex switching pedals...any interest? > >>At 8:24 AM -0800 3/22/99, Chris Chovit <cho@newdream.net> wrote: >>>You can use mutiple footpedals to control one EDP, but uou can't use one >>>footpedal to control more than one EDP at a time. (Unless you use the >DPDT >>>switches, as Claude suggested, to keep the circuits separate.) >> >>Matthias modified an echoplex pedal to work this way. It's pretty simple, >>just use an opamp to buffer the voltage to the other units. Perhaps he >>could explain for you guys. > >Yes, gladly: It works reasonably with the voltage buffer. If fact I made >one for the keys and another for the FB foot controler. >I use a 3 pos. switch to control either one or the other or both Plexes. > >One disadvantage is that the keys on the front pannel do not work any >more. > >Another disadvantage is that the control of both units is of limited use, >because they do not necessarily stay synced. I think it depends on the >phase of the software running in each machine (exact moment of power on, >in >micoseconds). I did not find a solution for this. >So now I use MIDI if I want them in stereo and set the Pedals for the >master. >If I want to use the units like two tracks, I disable MIDI on one of the >units (ControlSource parameter) and select the "track" with the switch. >Basically, you can do without the said preamplification. The only >advantage >of the buffer is that I can control Mute on both "tracks" or fade them out >simultaneously. Record is not recommended for the mentioned sync problem >and the other functions probably do not make sense on two tracks, do they? > >The buffer is an OpAmp with the output tied to the inverted input and the >Footswithes connected to the non inverted input with a resistor of 4k7 to >+5V. >For the FB pedal I connected my fader between 0 and +5V and the slider >plain to the non inverted input. It should also work connecting just two >pins (low end to ground/slider to non inverted), while adding a resistor >of >about 3k9 (adjust for the pedal range) to +5V. > >Happy soldering >Matthias > ______________________________________________________________________ Kim Flint | Looper's Delight kflint@annihilist.com | http://www.annihilist.com/loop/loop.html http://www.annihilist.com/ | Loopers-Delight-request@annihilist.com