The PSK Meter is pretty nifty. From their site:
...... a microprocessor-based RF signal sampler that periodically
checks your RF output, computes its IMD locally, and
automatically sets the sound card's audio level to provide the
highest RF output with minimum distortion. I too like the PSKMeter, because:
1) I can read the IMD and waveform right there on
the computer screen in another window.
Or the same window if things are resized.
2) It automatically adjusts the audio level. So it's a meter AND fixes any drive level problem. No more messing around with Windows Audio Sliders
or tiny pots on interface boxes!
The KK7UQ IMD Meter has an advantage in that you
don't have to hookup anything to the rig or hookup anything
to the computer. Sometimes less gizmos and wires
to hookup is better.
There's a place for both, it's a matter of preference.
73, Ken AD6KA