AudioDesk - Full-featured audio workstation software package for Mac OS X and Windows
Unlike other audio sequencers, AudioDesk places no limits on the number of tracks you can use simultaneously. AudioDesk supports simultaneous use of the MOTU AVB, ThunderBolt, USB/FireWire, and PCI drivers so you can use any combination of MOTU Audio interfaces to provide an extraordinary range of audio inputs.
AudioDesk's Bounce to Disk feature gives you an unlimited number of audio tracks by letting you non-destructively combine them into a single track or stereo track pair. Need to hear 100 audio tracks at one time? No problem. Bounce them down. A bounced mix plays identically to its source tracks, sample for sample. Original tracks are always preserved, so you can go back and tweak them if needed.