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Hi Per, Thanks! Your Midi port suggestion sounds like the solution I might need: I have a midi to USB converter so will try it out now….. Cheers, Steve On 15 Dec 2011, at 00:43, Per Boysen wrote: > On Thu, Dec 15, 2011 at 12:31 AM, Bingham Steve <stevebingham@me.com> > wrote: >> However as soon as there is audio playing then moving either of the >> expression pedals does what it's meant to, but also causes clicks and >> glitches in the audio! > > > HI Steve, > > MIDI port: > Long ago I had this "CC# sweep causing zipper noise" issue with an RME > Multiface audio interface when using the RME's MIDI ports. I found a > solution in not using the MIDI ports on the Audio Interface but a > cheap MIDI-to-USB cable/converter instead. > > Badly coded plugin: > Recently I've also had "CC# sweep causing zipper noise" issues related > to the SoundToys plugin EchoBoy. I talked to the developers about that > and had it confirmed that they know about the issue (but fixing it is > not their highest priority). When the plugin caused noise I was > controlling three of EchoBoy's parameters simultaneously from the same > CC# swept by the expression pedal. I fixed this issue by only > controlling one continuous parameter in EchoBoy and directing the > signal through two other plugins/mixer stages where I applied the same > exp pedal CC# to affect the other two aspects of the live morphing > sound. > > The audio interface I use now, RME Fireface400, is flawless with no > issues. Only convenience is the reason I plug everything in by USB > cables into a USB hub on the MBP - the 400's MIDI interface doesn't > have the issues of the earlier Multiface. > > Greetings from Sweden > > Per Boysen > www.perboysen.com > http://www.youtube.com/perboysen >