Roland System -1 synth latency problems


New member
I have just bought a new Roland System-1 synth.
I have plugged it into my Scarlett 18i20 via a jack cable and the interface's second input.
I'm currently experiencing a huge deal of latency issues when i try to use my synth on Logic 9.
On top of this when i turn the synth on it changes all the other tracks tho the synth sound.
I thought it by be the USB System-1 driver but i have successfully installed this.
My own suspicion is that i need to update my logic as it is an old version but any other suggestions to fix these two problems would be much appreciated.
Thank you