Changing one midi track's preset changes all of them

Hi everybody
I’m trying to use ReFX Nexus 2 on Cubase 5. I need to record 2 tracks with different presets on each, but when I change one the track’s presets, it changes the other track’s preset too.
Let’s say I recorded something with a piano preset, and I want to record something else with a bass preset on another track. When I change to the bass preset, the recorded piano now uses the bass preset.
Help please :frowning:

Make sure that the two tracks are set to different MIDI channels. If they’re both on the same channel, then any controller or program change commands on one track will also affect the other.