From their catalog:
"Right out of the box, every Proto-Sound 3.0 engine is compatible with all operating systems: conventional DC, DCC, and our own Digital Command System (DCS). "
"Proto-Sound 3.0-equipped locomotives can be controlled in command mode with any DCC-compliant command control system. This means you can use your existing DCC controller to independently control your other DCC-equipped locomotives in addition to your Proto-Sound 3.0 locomotives on the same track at the same time. When using a DCC controller, the following Proto-Sound 3.0 locomotive features are accessible:"
mthtrains.com/sites/default/files/HO%202019%20Catalog%206-14-19_lores_weblinks.pdfFrom their 2011 newsletter:
August 17, 2011 - Owners of M.T.H. HO diesel and electric locomotives equipped with M.T.H.'s Proto-Sound 3.0 onboard digital sound and decoder package can now upgrade their locomotives with new DCC features via a FREE software download from the M.T.H. website using DCS hardware. The new features will be accessible with most DCC controllers.
EXPANDED DCC FEATURES INCLUDE
Function Mapping
Advanced Consisting
Programming Track Support
Custom Speed Curves
The additional features were developed based on user feedback as to what the most popular and needed functions should be included on M.T.H. models. In total, the Proto-Sound 3.0 system now supports 109 CVs.
Upgrading the software requires the M.T.H. DCS Digital Command System and the latest Consumer Loader software (Version 2.30). You can learn more about the Consumer Loader by clicking here. Customers who don't have access to a DCS system should contact an M.T.H. Authorized Service Center to learn if they offer the upgrading service. While the software is free, a nominal service fee may be charged by a service center.