Graph Tech ghost Acoustic MIDI System - Steel String Guitar Pickup Logo
Posted on Dec 03, 2010
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Hi, Ghost midi pickup on MF guitar : Midi volume wiill not increase progressively. Look at data input in computer : controler 7 data from 0 to 15 = no sound then at 16 sound will be audible but already strong then if I roll up midi volume potentiometer then volume will increase and stop at 43 (maximum on this Ghost system). With another midi guitar GK3, controler 7 : from 0 to 127 progressive from no sound at 0 - perfect crecendo up to 127 (3 times louder then Ghost system maximum midi volume output). My tech just change the midi volume pot but it does the same thing... Any ideas of what could cause this ? ... If you like extreme midi guitar virtuoso playing check: http://www.youtube.com/watch?v=deoOaiqab6Q (On this video is the guitar with the problem above) Thanks in advance, Claude Lassonde recording artist for Universal Canada

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Fred Yearian

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  • Graph Tech Master 5,603 Answers
  • Posted on Dec 04, 2010
Fred Yearian
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Joined: Jul 25, 2009
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The first thing is to verify the pot you are using has the correct taper... there are several types and the nomenclature is NOT too consistent. The second thing is to measure the voltage out of the pot to make sure it covers the range between the outside terminals. After that measure the voltage across the pot... I suspect it might be 5 volts... if you find it way below that, that would certainly be the problem. Note: I do not have schematics for this product and my comments here are based upon my engineering experience and how this sytem is likely to work. The MIDI convertor MAY use a PIC processor or similar.

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