Hi Cansao!
bueycansao wrote: ↑Sat Feb 10, 2024 7:23 am
After a few months of using a Scartlett 2i2 with UbuntuStudio 22.04, I purchased a Scarlett 18i8 (Gen 3) because of the possibilities I have with my group.
The control panel works fine (I'm really impressed of the achieved work!!);
That's great, thank you!
bueycansao wrote: ↑Sat Feb 10, 2024 7:23 am
the issue I have is that I'm not yet experienced with routing. I want to connect two synthesizers and one drum-machine, all in stereo, to the 18i8, and hear them all 3 to 1 output (for instance the headphones jack).
At https://github.com/geoffreybennett/alsa ... r/USAGE.md I found this hint: "Note that a sink can only be connected to one source, but one source can be connected to many sinks. If you want a sink to receive input from more than one source, use the mixer inputs and outputs".
So if I want to connect the drum-machine to analog input 1&2, and the two synths to analog input 5-8, how do I use the mixer inputs and outputs to send the signals to the first headphones output (which are analog output 5&6)? Is there a must-read-document, or does anyone have a screenshot of the right configuration?
Keep reading down that document, to the "Mixer" section:
If you use the Routing window to connect Sources to Mixer Inputs and Mixer Outputs to Sinks, then you can use the Mixer window to set the amount of each Mixer Input that is sent to each Mixer Output using a matrix of controls:
The particular routing configuration that will do exactly what you requested above (and no more) is:
- Screenshot from 2024-02-10 20-43-27.png (120.22 KiB) Viewed 2840 times
And then the mixer controls should be set like this:
- Screenshot from 2024-02-10 20-44-25.png (19.52 KiB) Viewed 2840 times
Note:
Mix A (routed to Headphones 1 Left) gets the audio from Analogue 1, 5, & 7 (the left channels of your drum machine & synths)
Mix B (routed to Headphones 1 Right) gets the audio from Analogue 2, 6, & 8 (the right channels of your drum machine & synths)
That routing configuration has nothing connected to the PCM Inputs or Outputs, so there will be no USB playback or recording. I'm just showing the minimal configuration there for ease of understanding.
If you want to record your drum machine/synths on your PC, then you would also:
1) Connect Hardware Inputs Analogue 1-8 to PCM Inputs 1-8 respectively. This would let you do a multi-track recording with e.g. Ardour.
or
2) Connect the Mixer Outputs A & B to PCM Inputs 1-2 if you wanted to just do a stereo recording.
If you also want to play back from your PC & hear it in the headphones along with your synths/drum machines, then you would also connect the PCM Outputs 1-2 to the Mixer Inputs 7-8, and turn up the mixer knobs to put them into Mix A & B.
Finally, apologies for the "jungle of controls". It would be nice if you could tell alsa-scarlett-gui that certain pairs of ports are stereo channels, not independent mono channels, and route and mix them as such. That could reduce the number of mixer knobs by 75% in most cases and make it much easier to use.
Good luck, and let me know if you have any other questions!
Regards,
Geoffrey.