 MOTU's MTS, eMagic's AMT, and Steinberg's Midex 8 had implementations that were incompatible with each other, and required users to own software and hardware manufactured by the same company to work.Timestamping is built into FireWire MIDI interfaces, Mac OS X Core Audio, and Linux ALSA Sequencer.An unforeseen capability of SysEx messages was their use for transporting audio samples between instruments.