I'm still investigating and will post if I figure anything else out.

I haven't exactly solved the issue, but I don't think Logic is at fault here – probably it's either the Teensy (unlikely) or the GB link cable (more likely) or something else I haven't thought of yet (most likely).

That being said, I wouldn't recommend you use the Teensy sync, unless you just want to do it as a quick, fun project. It isn't stable enough (for me) for a live performance, because it skips notes in Nanoloop roughly about once every 50 notes (or maybe once every hundred).

I know that seems like insignificant because it's just 1% of the notes, right? Well, it actually skips a note about every 30 seconds, and from what I've read in other Teensy tutorials / discussion forums there's no way of making this any better.

And when I say "skip," I mean there's just a blank, totally silent beat where none of the tracks play. It's pretty noticeable and distracting in the middle of a song.

I've ordered an Arduinoboy kit from Meow Meow Meow:

http://www.meowmeowmeow.bigcartel.com/p … ammed-chip

And I think this will just have to be the way I go.

Well I'm actually not syncing to anything but backing tracks in Logic. I have an album's worth of recorded material, but the songs have backing keyboards, guitars, bass, drums, etc along with two GBs, and there are only 2 people in my band (including me), so we need to be able to have the GBs run by themselves in sync with backing tracks we've already recorded and then have ourselves able to run around on stage with other instruments.

But as long as you get it in sync, you shouldn't have any problems with outboard MIDI gear or VST instruments.

- does your daw have any audio latency correction settings?

However, it is now severely out of tempo with Logic. It is playing about 3 beats behind Logic (7 beats in Logic = 4 beats in Nanoloop).

Any ideas on what may be causing this?

The colors are pretty much different on all cables.

I just took a multimeter to the wires about 5 minutes ago and the wires were all wrong. Should've thought of that sooner!

About to eat some dinner and then will re-solder it with the proper wires and post an update when I get it working and feel dumb.

Thank you for sticking with me and all the help!

Yes nanoloop should respond to tempo changes. Have you tried filtering out the midi so you only send midi clock and nothing else?

Ha, yes. I've actually tried just about every combination of filtering signals and nothing made any difference.

So what I'm considering now is a bad wiring of the GB link cable wires, or that I possibly soldered the wrong ones? But there are only two, and I've done a lot of soldering in the past few months so I'm pretty confident with soldering projects.

Are the colors of wires in GB link cables fixed across all makes and models?

I followed little-scales' instructions from here:

http://little-scale.blogspot.com/2011/0 … or-16.html

Which say I need to use the blue wire for ground and orange for SI, and the others are unneeded. And I just ordered a brand new cable from Nonfinite and it worked just fine when I tested it out before splicing it up.

I'm just really wracking my brain here thinking for the cause of the problem, and nothing seems to make sense. I'm about to re-solder the GB cable to the Teensy just to be absolutely sure, although at this point I'm thinking that just making an arduinoboy may be my best option.

I would really suggest getting a proper sound card even though the mac ones are fat better than the pc ala realtek etc.. ones they are not made for music production. But maybe you can get low latency with it anyway with something like asio4all?

Yes you are correct, nanoloop dont need a special start command, just the clock signal. Have you checked that logic is sending midi clock?

Yes, I'm fairly certain that Logic is not at fault, because the Teensy is definitely receiving the MIDI clock because it blinks the tempo of my Logic session, and changes as I change the tempo in Logic. I also downloaded the application MIDI Monitor and it verifies that Logic is outputting MIDI to the Teensy.

Also, should Nanoloop respond to real time tempo changes once it is in sync?

Yes you are correct, nanoloop dont need a special start command, just the clock signal. Have you checked that logic is sending midi clock?

yes absolutely put nanoloop into slave mode. do this by selecting the '>>' icon on menu 2 (bottom - last icon on the right , hit select if you don't see it) and then press A+B - boom, slaved.
you will see an 'E' on the right side meaning nanoloop is an external mode.

Yeah, I sync it with a second GB all the time, but doesn't it need a start signal from the Master to get it going?

Whenever I put it in Slave mode when syncing to Teensy MIDI, Nanoloop freezes as it waits for the signal from the Master to begin the sync. And pressing Play in Logic does nothing to start the GB.

Do I need to add a connection to my Teensy in order to receive the Start/Stop messages from MIDI, or is that even possible? Thank you!

I'm using Nanoloop 1.5 on a DMG.