Dear All, inspired by the "A History of Audio on Linux somewhere?" I took a look at my very old Linux Audio projects. I have one which amazingly still compiles, namely FeigenSound from the Linux Magazin 03/2001, however I can't hear the output, even when the pcspkr module is loaded. I assume that todays Laptops just don't have speaker anymore. There I was using the KbdCtl.bell_* to generate tones with a given frequency and duration: // switch to new state KbdCtl.bell_percent = 100; KbdCtl.bell_pitch = Frequency; KbdCtl.bell_duration = Duration; XChangeKeyboardControl(pDisplay, KBBellPercent | KBBellPitch | KBBellDuration, &KbdCtl); Is there still such a simple method available to generate a tone with a given duration and frequency. Of course I could generate a corresponding array and send it to jackd, I'm just looking for something simple. Best regards, Peter