Sound jumps and scratches in Logic Pro 9 - help!
I have just bought and installed Logic Pro 9 (9.1.7) on my iMac (2.93 Ghz Intel Core i7, 8 GB 1333 MHz DDR3, Lion 10.7.4) and when I playback or just play an instrument (whether it's MIDI and / or audio files ) the sound picks and scratches like crazy. I have no idea what is wrong, because I can easily play music in Spotify, iTunes, etc. without any problems. One of my friends suggested me to put the I / O buffer size down to 128 from 256, and it also solved the problem for 2 minutes, until I put a compressor on a track. Then it began to sputter and crackle again - all the time - even though I deleted the compressor again. Do you have any idea what is wrong and what I should do to solve the problem? Thank you!