I'm having an issue with my Omega 90. I'm controlling it with an Omega 3000 switch. Every time I tap the horn ring to change tones, the sweep doesn't sweep. My speakers make a loud continuous "farting" noise. Then it won't switch back to the primary wail tone. It just continues to fart. Any ideas on what's going on with it? Is it the amp or maybe the switch? I need to figure it out cause I need my sweep tones!!