I have the following CV values
CV7 = 48
CV7 and CV8 are reversed. Value 48 is CV8 code for Hornby Hobbies
CV7 = 132 is decoder firmware ID. Read this in conjunction with CV159 and you can ID the loco type.
CV182 is normal master volume. Value 4 is default (range 0 to 8).
CV184 is offset location of master volume on a small batch of errant decoders.
CV189=255 (This CV not listed in JMRI, what its function?)
CV189 is offset location of master volume on a very recent batch of errant decoders.
I only asked for the latter values to see if changing them had an effect on actual volume and if so which one.
If you are sure the speaker and its connections are OK , then the decoder is likely to be U/S.
thanks for that explanation also my typo with CV7 and CV8.
After more resetting still nothing so the speaker wires will be removed and the decoder becomes a non-sound spare