While I agree that timidity currently has no means to autodetect the configuration, I'd think that dropping the configuration file in /etc/timidity/fluidr3_g[ms].cfg would make it easier for the user to select an alternate configuration by manual editing of timidity.cfg.
While I agree that timidity currently has no means to autodetect the configuration, I'd think that dropping the configuration file in /etc/timidity/ fluidr3_ g[ms].cfg would make it easier for the user to select an alternate configuration by manual editing of timidity.cfg.