The Natural Philosopher wrote:

Yes. that should work if you have a decent package.
Audacity is not bad for that.

Thanks. I do have Audacity, and the mixer program I'm using (MixPad) also
has a built-in compressor. MixPad has a preset called "general voice level"
which I suppose should be OK but Audacity requires manipulating a slightly
daunting array of parameters. I suspect that this would give a better
result if only I knew what settings would be best.