Short version: *Installed ACID *Have audio popping problem with USB transmit (output) audio. *I'm not surprised didn't expect it to work perfectly first attempt. *Only tried one combinarion of hardware/cpu/motherboard so far.. I need to try other motherboards/CPUs. * Tried 3 different USB devices and ports. * played with moving interrupts disabling motehrboard built-on hardware etc. * CPU runs at about 10% while USB radio is active.. * Loading PC heavily by running gzip -9 seti@home Lots of disk access lots of network activity seem to have zero impact on the popping frequentness. * I'd like to know if anyone else here has had this or similar problems with consistent audio from the USB device (CM-108) and what they may have done to make it work better. Long Version: I gave it a go and went the 'easy' route just to get started.. I ended up trying it out on that 1.1Ghz AMD Duron CPU rack mount server.. I must say I'm extremely excited & please with this software.. But it would be too good to be true if it all just worked first try.. and of course would take all the 'fun' out of getting it to work.. Ok enough small talk (haha) Here's what I have going on: Everything works except I am getting intermittent audio popping in the audio output of the USB sound device. VERY intermittent maybe about 3-4 'pops' every minute on average.. 10 at most sometimes.. and other times several minutes go by without a 'pop'. It seems to mostly occur during the CW ID beacon which I have going every minute.. The pops that are heard only happen when the 'transmitter' is active sending PL or CW ID or PLAYBACK... My test arrangement has "radio key" running to produce continuous PL and occasional audio popping. There is no radio actually hooked up yet. OK will talk about the hardware a bit.. and probably worse case scenario here due to an 'all in one' motherboard.. It's a MSI 6378 'budget' Athlon board.. everything built on. Has USB 1.1 *NOT 2* I don't know/think this matters for a sound device. Here's all of the things I have tried all of which have absolutely no effect on the intermittent popping... 1. Disabling everything not needed on motherboard including ethernet for test.. ethernet + usb share an interrup line and there is no ability to re-route this in the bios so I turned off the ethernet on the motherboard for testing. 2. Carefully monitor CPU during audio pops running 'top' around 20 updates per second (this alone takes more CPU load than asterisk /app_rpt + usb radio. 3. On this motherboard the USB controller and ethernet share a PCI interuupt line and you cannot change it. I've tried disabling the built on ethernet and still get the popping.. I've also flood and large pinged the machine which genreates huge numbers of interrups from the ethernet chip and this has no effect on the popping.. 4. Tried other USB fobs with same chipset. Created various types of heavy system activity to see if it has any impact on the popping heavy disk use hevy network use and heavy vga use (text mode) moving interrupts (changing them) on the motherboard.. getting usb controller onto a different interuupt (ethernet ends up on same). 5. Measured and scoped 5V output on USB to be sure 'popping' sound is not coming from 5V power supply. 6. Am really looking to hear what some others experience has been with this.. what works and what does not? The popping very much sounds like an interrupt issue or some kind of issue where the task of sending and audio stream is completely dropped for something else and then resumed leaving lots of holes heard as pops in the output stream. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.