<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">The keyboard contacts are dirty/oxidized and producing noise bursts (contact bouncing) when they make or break.<DIV>The portamento is a lowpass filter that removes the noise bursts after the keyboard circuit.</DIV><DIV>My guess is cleaning all the contacts with 91% isopropyl alcohol would improve or cure the noise problem.</DIV><DIV><BR><DIV><DIV>On Nov 8, 2005, at 12:57 PM, Logan Mitchell Sr wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV>11/08/2005</DIV> <DIV> </DIV> <DIV>I have an ARP Solus that produces key-press/key-release clicks that only seem to go away when I increase the portamento. Does anyone have a solution to this problem and/or the schematic diagram and could this be an indication that the problem is in the portamento circuit ? Thank.</DIV> <DIV> </DIV> <DIV>Logan Mitchell Sr</DIV> <DIV>Baltimore MD USA</DIV><DIV> <BR class="khtml-block-placeholder"></DIV><HR size="1"> <A href="http://us.lrd.yahoo.com/_ylc=X3oDMTFqODRtdXQ4BF9TAzMyOTc1MDIEX3MDOTY2ODgxNjkEcG9zAzEEc2VjA21haWwtZm9vdGVyBHNsawNmYw--/SIG=110oav78o/**http%3a//farechase.yahoo.com/">Yahoo! FareChase - Search multiple travel sites in one click.</A> </BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>