Easy, Garageband. I use it with my Gearbox software and Toneport. I have Audacity, but because I already had Garageband, and knew how to use it, I never use it. I suppose I could get Logic or LogicPro someday, but I don't think I need it. GB is free with my machines, and does what I need.
EDIT: I wrote mine before I finished reading your answer Robert. I didn't really mean to copy yours.
Steve Thompson
Sun Valley, Idaho
Guitars: Fender 60th Anniversary Std. Strat, Squier CVC Tele Hagstrom Viking Semi-hollow, Joshua beach guitar, Martin SPD-16TR Dreadnought
Amphs: Peavey Classic 30, '61 Fender Concert
Effects and such: Boss: DS-1, CE-5, NS-2 and RC20XL looper, Digitech Bad Monkey, Korg AX1G Multi-effects, Berhinger: TU100 tuner, PB100 Clean Boost, Line 6 Toneport UX2, Electro Harmonix Little Big Muff Pi, DuhVoodooMan's Rabid Rodent Rat Clone, Zonkin Yellow Screamer Mk. II, MXR Carbon Copy Delay
love is the answer, at least for most of the questions in my heart. . .
- j. johnson