Re:Crackling audio on and off in sonar 8
Are you running in ASIO or WDM driver mode (Options-Audio-Advanced)? If WDM, run the Wave Profiler so it sets the options properly for the card.
Try moving the latency slider in Options-Audio to the right and see if it goes away. If you have the latency set lower than the soundcard can handle, it will make noise.
Go to Options-Audio-Drivers and make sure only the M-Audio drivers are selected for input and output.
What version of Windows? Unless you're running 64 bit Vista or 64-bit Windows 7, you can only use up to 3GB of the 4GB you have installed.
Computer: Intel i7, ASROCK H170M, 16GB/5TB+, Windows 10 Pro 64-bit, Sonar Platinum, TASCAM US-16x08, Cakewalk UM-3G MIDI I/F
Instruments: SL-880 Keyboard controller, Korg 05R/W, Korg N1R, KORG Wavestation EX
Axes: Fender Stratocaster, Line6 Variax 300, Ovation Acoustic, Takamine Nylon Acoustic, Behringer GX212 amp, Shure SM-58 mic, Rode NT1 condenser mic.
Outboard: Mackie 1402-VLZ mixer, TC Helicon VoiceLive 2, Digitech Vocalist WS EX, PODXTLive, various stompboxes and stuff.
Controllers: Korg nanoKONTROL, Wacom Bamboo Touchpad