[Amps] Two-tone test file uploaded

[Jim Barber]

Based on the recent IMD thread, I generated a 30 second two-tone test 
WAV file and posted it to a publicly-accessible server:

http://www.n7cxi.com/public/two_tone_44.1_mono_24bit.wav

The level is -1dB, which works around the problem of cheap PC audio 
codecs distorting rail-to-rail signals. The format is 44.1 kHz mono, 
24-bit PCM.

If anyone wants a different sample rate, bit depth etc. drop me a note.

73,
Jim N7CXI