rem: virtual std::string description(void) const { return("Interface for MIDI->audio converters that support i/o using standard streams."); }
add: virtual std::string description(void) const { return("Interface to MIDI-to-audio converters that support UNIX pipe i/o."); }
context:   virtual std::string description(void) const { return("Interface for MIDI->audio converters that support i/o using standard streams."); }