512mb card will give you 1 hour and 36 minutes of 16bit 44.1khz recording time, and twice that in the extended mode..(which again the extended mode I think is above cassette tape 4 tracks quality)

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.