Hello,  I was wondering if anyone could help me with this.  I have searched through the forum but haven't found anything that quite matches what I am looking for.   
I am using a Motu 2403mk3 as my audio interface.  I have an old Alesis QS8.1 as my controller.  I have the controller midi'd into my system and also lightpipe to my audio interface.  It is possible to use the sounds from my keyboard through the lightpipe and record them into Cakewalk by Bandlab?
 
Thanks.

I have a QS 8.1 as well, though I've never used it's light pipe for audio signal. I would think that getting the Muto to act as the master clock might be the key. You might have to dig into the Alesis a bit to set the clocking as slave and need to edit the global settings in the QS. If it only operates as the master clock then you'll need to set the MUTO clock to slave.

Bramwill:
 
I love the Alesis QS series synths.  I have an original QS8 and the sounds are fabulous.
 
I made this post a long time ago to help someone set up their QS8 so that they could choose the QS patches on the MIDI tracks in Sonar, play on the QS8, record the MIDI in Sonar and hear/record the sounds on the QS8.  (I don't even remember what version of Sonar I was on at the time so the menu items/dialogs may be different.)
 
Here's a pointer to the post.  It doesn't talk about recording the audio, but I believe you would just run the audio signal out of the QS and into the MOTU, then record the audio into audio tracks in Sonar.
 
Check it out and see if this helps you,
Paul

I would think that if you already have the QS8.1 connected to the optical inputs in your audio interface, they should be available to select as audio inputs in Cakewalk Preference > Audio Devices.  Make sure you check the selection box next to the input.  This should enable them to appear in the track input selections.
 
Recording the optical audio outputs in Cakewalk should be the same as connecting 1/4" audio cables from your keyboard to the interface.
 
Select and arm the audio track that you want to record on.  Select the optical audio input in the track input selections, and record.

I have used both a QS8 keyboard and QSR module with ADAT via MOTU 2408. In both cases, I had to slave the MOTU to the Alesis (i.e. set Clock Source in MOTU Audio Console to ADAT); slaving the other way always resulted in distorted audio from the Alesis. And, of course, you need to enable the ADAT inputs in the MOTU Audio Console and in Audio Devices in SONAR to make them available as track Inputs.
 
Otherwise it integrates just like any hardware synth.

Thank you for your quick responses.  I really appreciate it.  Looking at the post from kellerpj I can see I have some work to do to get it set up properly.
Again, I really appreciate it very much.
 
Dave