I’ve tried this.
To allow Renoise to create realtime threads, which are required for low latencies with ALSA or JACK, you have to edit the /etc/security/limits.conf file. A realtime kernel does NOT help here, does not set the required options automatically! To enable RT thread creation via PAM open the /etc/security/limits.conf file as root (or via sudo). Then somewhere at the end of the file add:
YOURUSERNAME - rtprio 99
YOURUSERNAME - nice −10
But it wont let me save the file. What do I do?