PINTO It is not possible to program the volume in this module, except in the settings of the device that sends the signal. This is something missing. Which is unfortunate and no one I know really understands this process. In fact, the problem you have in this module is related to the module's Gain structure and it is not possible to satisfactorily resolve this issue. I bought one of these modules and the subsequent decision I made was simply not to buy any more Bluetooth amplifiers (MH-M38). I only buy the MH-M28, which works properly, adding it to a normal amplification module. Hope I was helpful. Best Regards. Macedo Pinto Portugal

PINTO You need a program that allows you to perform this function. And a programmer for that purpose. It is a matter of reprogramming but I do not know the name of the programming suite. It depends on the manufacturer of the module. I only know that it is a little complicated process for me.

PINTO Yes.They do exactly the same work.