How to play test tones in Open Firmware: Using recent firmware (Q2C12 or later):
ok select /audio ok decimal ok 400 tone ok 800 tone ok 1000 tone ok 2000 tone etc. The tone is played first on the left channel, then the right. Frequencies that divide 12000 evenly have low distortion. Other frequencies will have distortion to varying degrees because of the quarter-wave synthesis technique that is used. The level is pre-set at the highest level that the speakers can handle before the onset of overload distortion (mechanical clipping, I think; the amplifier still has some headroom as determined by replacing the little speaker with a much better one). If you want to change the level, ok patch -15 -9 tone \ Changes the output attenuation from the default of -9 to -15. _______________________________________________ Devel mailing list Devel@laptop.org http://mailman.laptop.org/mailman/listinfo/devel
