Cheap old Thinkpad, Linux + Renoise works well, especially if you add one of those old RME PCMIA interfaces. If you set it up so that it boots into Renoise It's

Cheap old Thinkpad, Linux + Renoise works well, especially if you add one of those old RME PCMIA interfaces. If you set it up so that it boots into Renoise It's basically like a standalone instrument, like a MPC or Octatrack.