Dan - I install Massoth and ESU DCC Sound Decoders for customer's LGB locomotives, and I installed a LGB 65001 American Steam Sound Module into a customer's LGB Mogul's Tender last month for a customer's DCC layout. But I've never used a Hall Sensor in one, so no experience to share with you on that. I've always used the electronic chuff and adjusted the starting voltage and other elements, if necessary, using the CVs listed in the Owner's Manual. I see that CV64 is used for Synchronizing a wheel sensor (see Fig. 2) (9..255) [82] If the wheel sensor is not installed on a drive axle, you can adjust for different wheel diameters. You also can program the number of magnets.
Since you don't have a DCC system to adjust the CVs, perhaps you can take your unit to someone who does have a DCC system. If there's a Large Scale Club in your PA area, someone there probably has a DCC system that could assist you. Alternatively, you don't need a DCC system if you can find someone who has a Massoth DiMax PC Interface Module that connects by USB to a PC, you can program the CV settings for all Massoth and LGB DCC devices such as the LGB Sound Module you have. You just power the device with at least a 2 amps DC power and then use the screen on your PC to read and write CVs. You can also do a factory reset on the LGB Sound Module if necessary using the PC Module.
I'm an online LGB and Massoth retailer but I'm out of stock right now on the LGB Sound Modules, otherwise I'd test a Hall Senor on one for you. Feel free to email me directly if I can be of any assistance:
OldDominionRailways@gmail.com
Thomas White