The MOTU Audio System (MAS) looks to the Finder (the Mac OS) for available
memory. You can use your Extensions Manager to increasing performance under
MAS. You may experience the "Ran out of record buffers, too many tracks, too many
effects" with just a few tracks, or you may want want add to the number of tracks and
effects in a current project. Go to the Apple menu and select Control Panels/Extensions Manager. Create a custom extension set that includes all the control panels and the following extensions only:

For OS 8, 8.1
DigiSystem INIT (if you own ProTools hardware or AudioMedia)
Korg 1212 driver (if you are using a Korg 1212)
FreeMIDI Power Plug
FreeMIDI System extension
PCI-324 Sound manager driver (if you have a 2408 system)
Serial Tool and/or Serial (built in)
Shared library manager
Shared library manager PPC
SOM Objects
Sound Manager

If you are running 7.6.1 or earlier, add the ObjectSupportLib extension.

this may vary a little with newer Mac OS versions. Most of the essential will be in the Mac OS?.? base extension set