For each MIDI channel, the MIDI In Device contains the following items:
The Device Pop-Up menu is used to select which device the channel should send MIDI to.
Only existing devices are available on the menu.
The Name field displays the name of the device connected to the channel.
This is blank if no device is selected.
A note on indicator shows if MIDI is received on this channel.
These four buttons labeled A, B, C and D are used to select which of the four buses is currently displayed in the MIDI In device. If you have a multiple port interface you can use up to four buses (or ports), each with 16 MIDI channels. The Bus Select buttons determine which of the buses is currently in view in the MIDI In device.
Reason supports up to 64 audio output channels.
Each output features a meter and a green indicator which will be lit for each channel that is available.
Remember that the Hardware Interface is where any possible audio clipping will occur in Reason. Keep an eye on the clipping indicator on the transport panel, and also on the individual meters in the Audio Out panel. If a channel pushes the meter into the red, the output level of the device should be reduced.