Robert Huitl vdr@huitl.de wrote:
You could use XMMS and add a url tone://12000 to the playlist (you need the tone generator plugin, of course). Or try Audacity, even though that's kind of oversized ;)
aaaah - I forgot that. OK I can hear 17 kHz just fine. 18 is very low but that may be the plugin, soundcard, or headphone. Or my ears. Dunno. Will have to x-check.