Make sure your sound card is calibrated for your FLDIGI software using CheckSR.exe. Olivia and MT63 will really benefit with this calibration. CheckSR.exe comes free with MixW software. To get the software without MixW and some good instructions, go to the Western PA Amateur Radio EmComm Digi Net Website Click Here. These guys did a good job with their website with NBEMS and FLdigi.