FireWire Driver Latency (Settings Menu)
The Saffire PRO 40s latency performance will be dictated by the Core Audio buffer size specified in your DAW (Mac,) or as set in the ASIO buffer size (Windows).
The Firewire Driver Latency affects the performance of the Core Audio or ASIO buffer settings.
If you are experiencing clicks and pops or audio dropouts, this may be due to certain hardware in your computer that is affecting the performance of audio devices connected via FireWire.
Rather than removing and replacing hardware (e.g. your graphics card or wireless internet card) trying a longer Firewire Driver Latency setting may solve the problem.