Inadvertent midi output from Logic

Does the Roland have a built-in USB or are you using an inexpensive USB to MIDI interface?

See this thread for a pic I just posted.

https://discussions.apple.com/thread/5125581?answerId=22342599022#22342599022

This interface is proving problematic on..

1. newer machines

2. recent operating systems

3. Latest version of Logic

What was changed two weeks ago, any upgrades to the operating system or Logic?

Other possibilities... a MIDI doubling or MIDI loop, these are separate problems and not necessarily related to each other.

If the Roland keyboard has a "Local" MIDI control, turn it to OFF. This separates the keyboard from the Roland's internal piano/sound module. That way MIDI is not reaching the keyboard from two routes, internally and through MIDI.

You didn't previously mention it was an SX model, those are newer, the older Roland's did not have the USB connection.

Local control should be very easy to enable disable. When it's OFF, the keyboard will be able to play itself Through Logic but will not sound when you choose to play through a soft synth. When you want to use the Keyboard without Logic running simply switch Local to ON.

The other thing to check in the Keyboards MIDI section is to see if a Soft Thru is enabled. Some keyboards have the ability to echo the MIDI Input to MIDI out, when using Logic this creates a MIDI loop, often with the resulting stuck low notes.

There's a couple of other possibilities if these fail.

The reason I asked about updates is the possibility that either the most recent Logic release and or recent operating system is having problems with some USB MIDI interfaces.

edvinpedvin wrote:

Nope,

local control doesn't change anything in my case.

BTW, it's not the selected piano sound of the RD300SX that's sounding, it's the first strings/pad patch, sounding note C0.

I can't tell whether it has MIDI soft thru, that's not mentioned in the manual.

E.

I realize it's not the keyboard sound that's causing the problem, it's just that if MIDI was doubling up at the keyboard it's possible it can send bad data out.

The other possibility causing a lot of problems as of late is control suraces, this is easy to check.

In the upper left "Logic Pro" menu, select Preferences, slide down to control surfaces and select Bypass All Control Surfaces.

See if that helps

Sounds to me like Logic is sending a signal to make the red light on an external control surface (like Logic Control by Mackie) flash to indicate record ready. Go to your control surface setup and see what's going on there. If you're not using a control surface you can delete what you find there.