Audio
When DrumMapMidi opens, a collection of audio sounds is assigned to the playing buttons. This allows you to get started, or explore when you have only a few minutes to play, but the main reason DrumMapMidi was designed is to play General MIDI drum kits in other apps by sending MIDI information to them.
Setting Up the MIDI Connection
When sending midi to another app, the usual setup process is:
1 - Open the other app first and select a drum kit.
2 - Play a few drums to make sure you hear them playing.
3 - Find the setting for "Background Audio" and make sure it's on.
4 - The MIDI channel should be set to 1. (You can use a different MIDI channel if you also set DrumMapMidi to send on the same channel.)
5 - Finally, open DrumMapMidi. Opening DrumMapMidi last establishes the MIDI connection.
6 - Note: if you open DrumMapMidi first, and the other app later, you can touch "All Off" to open the MIDI connection to recently opened apps.
7 - Turn Audio off and MIDI on.
8 - Important Note: some apps require a MIDI bridge before the MIDI information will flow. In these situations, the MIDI bridge app I use is a free one called FreEWI (by Audeonic Apps). I open FreEWI and just leave it running in the background. Here's an example scenario.
Example: GarageBand has some great-sounding acoustic drum sets, but it requires a MIDI bridge to "hear" the instructions coming from DrumMapMidi. If you set up one of the drum sets on a channel in GarageBand, and also open FreEWI (leaving it on and running in the background), then when you open DrumMapMidi the MIDI signals will be sent to FreEWI and then over to GarageBand.