Select the "marimba1-L" track by clicking in the track's control area, underneath the controls.
The editor mixer to the left of the canvas area should display the track's name near the top, and the track's colour (probably green in this case).
If you can't see the editor mixer, open it by using the menu. Click 'View > Show Editor Mixer' so that it is checked. You can also press 'Shift + E' on the keyboard to toggle its display.
After confirming that the editor mixer is showing the control for the "marimba1-L" track, look at the button on the bottom of the editor mixer, above 'Comments'. It should say "master", which means its output is connected to the master bus. This is not what we want, so click the "master" button.
When you click the 'master' button, a menu pops up, allowing you to choose a different output. We want to connect the track to the "Bus-marimba1" bus, which isn't in the list, so choose 'Edit' from the menu.
The connection window that appears looks confusing, but it isn't. Here's how it works:
The left side, labeled "Outputs," contains two output channels, "out 1" and "out 2," along with a list of everything to which those outputs are connected.
The 'Add' button adds an output channel. We're outputting the signal to a stereo bus, so two is enough.
The 'Remove' button removes an output channel.
The 'Disconnect All' button removes all of the track's output connections.
Clicking a connection in this list will remove it.
The right side, labeled "Available connections," contains a list of all of the inputs offered by JACK
.
Each JACK
-aware application has a tab with its connections listed underneath.
Clicking a connection in this list will add it to the last-selected output channel.
Click the 'Disconnect All' button.
Click in the empty "out 1" list.
From the "Available connections" list, click on the "Bus-marimba1/in 1" connection. It will be added to the "out 1" list.
Then click on the "Bus-marimba1/in 2" connection. It will be added to the "out 2" list.
The appearance of the connection lists will change to indicate that you've added a pair of connections.
Click 'Close' to enable the connection change.
Note that the "master" button now says something like "Bus-ma," because the track's output connection has changed.