Audio Input changes when adding new audio tracks

Hi,

When adding a new audio track while having already audio track/s in your project in Cubase 6.5 (happens in C5 as well), the input source of the previous track changes/cycles to the next input available.

I would like to disable this setting, the input source of my Bass track should still be connected to the port I’ve hooked my bass guitar to, rather than changing to the input I’ve connected my microphone to.

I’ve looked over all the settings in the Preferences, googled it many times, searched through this forum, and couldn’t find anything about this.

Please help if anyone knows how to disable this.