PH1975 mentioned the "latency problem" when using a TPC (or the equivalent inside a modern ZW-x), and RickO mentioned the MTH features listed on Page 20 on the Legacy Powermaster Operator's Manual. Combine these two and you'll find the answer to solving the latency issue.
The latency problem occurs when you need to press the horn/whistle and/or bell buttons with precise timing between pushes, such as when configuring a PS1, 2 or 3, locomotive for advanced conventional features. Doing so using the whistle/horn and bell buttons on a CAB-1, 1L or 2 is iffy at best. The timing from your finger pushing the button, to the resulting signal going through the CAB-x and the command base, is normally not precise enough to support this.
To send out whistle/horn and bell signals with acceptable timing use the "Fast Horn" and "Fast Bell" functions seen on Page 20 of the LEGACY Powermaster Operator's Manual (thanks RickO), and also below from the operator's manual for the last edition of the TPC's (6-14189, 71-4189-250 from 04/2004).
To use Fast Horn or Bell do an AUX1 - 3 button sequence for "Whistle/Horn", and an AUX1 - 6 for "Bell".
Mike
