2) Laptop/Desktop? 2010 iMac 27"
3) Operating System? OS10.6.8
4) Ableton Live version? 9.1.6
5) CPU Make, Model, and Speed? 2.5 quad i5
6) Amount of Ram? 24Gb
7) Soundcard Saffire Pro 40

9) Number of playback tracks? 8
10) 64 or 32bit live? 64 bit
11) Max number of tracks before crackle 40ish
Focusrite! At least make your drivers perform on par with Built-in Audio, sheeeeesh!!!