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Looper's Delight
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Duh...What's the difference between "Volume" and "Expression" pedals? I always thought that they were the same. How can I tell which one I have? At 12:04 AM 11/25/98 -0800, you wrote: >At 8:04 PM -0800 11/24/98, Sean T Barrett wrote: >>kim: >>>Only down side is the log taper on volume pedals... >>>linear seems a bit easier to use for feedback control. >> >>Couldn't the software reinterpret this--apply a curve >>to the input numbers to (approximately) linearize it? > >yeah, that would be easy enough. Of course, then you have the opposite >problem with anyone using linear taper pots. So then you end up adding yet >another parameter to allow a choice, and then a lot of time explaining >what >this obscure log/linear parameter does....:-) well, there would be one >problem with this, in that the analog level runs through an a/d convertor >with a fairly limited range. you'd probably end up with some weird >resolution problems in some parts of the pedal range. > >anyway, for John, here's how to set the trimpot: > >********************************************* > >This requires that you actually open up the unit, and have it opened with >the power on. *Please follow appropriate electrical safety rules!!* If >you >are not careful and you fry yourself, please don't blame me! > >There's a trimpot on the PCB, near the left side, by the volume knobs. >It's >job is to trim a dc offset from a VCA. Sounds like your's is not set right >for some reason, which would cause the thump you hear. > >To set it you need to run one of the built in diagnostic tests. The test >basically turns the VCA on and off at about 60Hz, so if there is an offset >you can hear the resulting tone in an amplifier. (or see it on a scope, >whichever way you like.) While that's going, you adjust the trimmer until >the tone/waveform reaches it's mimimum. > >To get into the trimmer test, Start the unit while holding the Parameter >and Record buttons down. Keep them held while the startup screen goes by, >until the display shows all t's. Then let go. Should say 7F. Press >parameter so the "Keys" LED is lit, then press Insert to start the trimmer >test. > >You should hear a ~60Hz tone in an amp. (turning input volume off, mix to >"loop", and the output volume up helps.) The tone will change in level as >you adjust the trimpot. Adjust to where the tone is at it's lowest level. >(you'll still hear hashy noise sounds, but the 60Hz should become nearly >inaudible.) After you set the trimmer, pressing parameter again will >stop >the test. Then you can turn the echoplex off and power back up normally. > >********************************************** >kim > > >______________________________________________________________________ >Kim Flint | Looper's Delight >kflint@annihilist.com | http://www.annihilist.com/loop/loop.html >http://www.annihilist.com/ | Loopers-Delight-request@annihilist.com > > > ========================================================== Howard Harawitz howard@brooknorth.com ========================================================== Brooklyn North Software Works Inc. Halifax, Nova Scotia, Canada Telephone: 1-902-423-0257 ========================================================== Check the Halifax Harbor Cam: http://www.brooknorth.com/camsite/