detect no player working in background

[Konrad Kostecki]

If no player is working while AmiModRadio is starting, AMR should let know the user to start one of supported players.

[Tygre]

If AMR cannot connect to any known player, it will try to start each player one after the other (assuming that one player is in AMR's path). If it cannot start any player from its path, it will throw an error. This feature will be available in v0.92 (15/08/23).

[Konrad Kostecki]

Thanks!