This week I found another Boss RC-300 at an old secondhand shop in Nagano-city. I actually use my first Boss RC-300 quite extensively and probably will never sell it unless something better comes along. Although I love the RC-505 Loopers, you can’t effectively use it with your feet. So the Boss RC-300 is still “the Boss” for the floor..laugh. What I wanted to do was understand better how to sync the two RC-300 Loop Stations together as explained in the manual. After working with the pair for about an hour I discovered some important points about this setup.
Most importantly is, YES, two RC-300 Loop Stations sync perfectly when setup exactly as indicated in the manual. Set the slave to sync via midi and make sure the Sync All Start/Stop is set to Start/Stop. Also make sure of course that your midi cables are setup properly with the Master out going to the Slave in. You only need one connection from the Master to the Slave.
One MAJOR omission from the manual is that you cannot have the master in “Singular Track Mode”. Singular Track Mode is where you run each of the three tracks in singular fashion rather than layering them. The reason is that when you press the “All Start/Stop” on the Master, it will NOT start the Slave RC-300. You must have it in Layer “Multi” Mode and THEN it will start the Slave RC-300. Now the Slave RC-300 can either be in Track or Layer Mode. It doesn’t matter which, so this is nice as you can then use the slave for your Track Mode if necessary.
On the other hand, you CAN set the Master to Singular Track Mode and it will send the midi clock signal to the slave RC-300. It just won’t start playing any of the tracks. This isn’t a problem if you don’t mind starting the tracks on your own. If you then press “all stop” on the Master, it will successfully stop all tracks.
Basically, my initial plan was to put three different drum loops on the Master RC-300. I then wanted one Bass Loop running on the Slave. I wanted the Track 1 drums to start and have the Track 1 bass start at the same time, however this won’t work as the Master RC-300 is in Singular Track Mode. If I set it to Multi Mode, then all three drum tracks will start playing along with the Track 1 Bass on the Slave. So I basically have to start the drums and THEN step over and start the Track 1 of the Slave if I want it to work my way. Indeed it all will be in perfect sync but it literally means I have to add an extra step…laugh.
Everything else so far works great and MUCH better than trying to sync a Boss RC-50 with the RC-300.
Stay tuned for further updates as I research this setup a bit more.
Jim Atwood in Japan 
Hello !!!!What about synchronizing boss rc 505 with boss rc 300 is it possible?
Hello, I am loop artist and have settled upon this as main setup: RC300, PODHD500X, VoiceLive Touch2 with switch6, iphone controlled by iRig keys… not going into signal chain, I’ll come right to it… I’m a newbie to MIDI but want RC300 as master and want tempo sync’d on POD and VLT2. I ‘think’ this is possible with midi out RC300 into POD with thru to VLT2. There is various terminology and info/instruction which hard to decipher. Any chance anyone would be willing to take look and comment ?