Horseshoe Curve Locomotive Audio Mods

Yes.

?

esu is a sound decoder for model trains and the sounds are copyrighted from what i know.

ESU sounds are not copyright protected, read the EULA, as follows:

2. PROHIBITED USES
   Neither you, nor anyone at your direction, shall:
   2.1 use the Content, or any part of it, for any public performance, live broadcast or time delayed live broadcast where the Content is used unattended for commercial purposes without ESU' s prior written consent;
   2.2 use the Content, or any part of it, in any competitive product;
   2.3 sub-license, copy, reproduce, transmit, assign, rent, sell, lease, offer on a pay-per-play basis, distribute for money or any other consideration, or commercially exploit in any other manner or through any medium whatsoever or otherwise transfer in any way the Content or any part thereof;
   2.4 manufacture and/or distribute for money or otherwise commercially exploit any product that incorporates any part of the Content. If you wish to use any part of the Content for manufacture, resale, sub-license or further distribution, you must contact ESU (and where relevant, its licensors) to enter into an appropriate agreement with ESU (and, where relevant, its licensors);
   2.5 publish the results of any analysis or comparative evaluation of the Content or any part thereof without ESU' s prior written consent;
   2.6 reverse engineer, recompile or disassemble any part of the Content except to the extent and in the circumstances expressly permitted by ESU and its licensors in writing or by law;

No where does it state that it cannot be reused for freeware purposes, only for Payware.

-Andrew from the official ESU Custom Installs page

Can't. It's hard coded to cut off at a certain point for some reason.

i honestly feel like the horn isn't abrupt enough lol. the horn control is horrible on this train. only an update from dtg themselves would fix this, and that'll likely not happen for a long time.

IMHO, the ES44C4 sounds need to be ported over to this engine. They are spot-on for the GEVO units I hear working the NS Lehigh Line that goes through my area.

W2SJW I 100% Agree with you the C4 Sounds Great