Nico_Noyau wrote:Some of my pots are "scrintch scrintching" when I turn them, it is the case for the ones for delays and the one for arpegiator...
Is it the same to you ?
When i bought My JP8K a couple of the pots didn't function as they should.for instance the Osc "Range " pot would always make the range jump to -24,no matter which way i moved the pot,which was quite annoying and also the Volume Pot would never stay at the level it was set,you only had to move it slightly and it would jump to zero Volume,I replaced the Pots with some new ones from Roland and they've been working as they should since....
Never had a problem with my rack,but thats more than likely because i look after my gear ,and had the rack from new,hence probably why the synth was in need of Repair,seeing as it was secondhand,and obvious that the previous owners weren't as caring for the synth as I am(thankfully its in safe hands now

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It could be as GJ has said that the contacts are dirty,as is the normal case when you get scratchy pots(i had this on my old Behringer mixing desk and all was needed was a clean up with compressed air to blow out the dirt)but given that the Pots on the Rolands seem to be very poor Quality(Phaser effect will back me up on this one) and the JP s reputation for problems with the pots,I'd say it was a little more than just dirt.... and worse case scenario need replacing