Started WW and selected PSK31.
noticed the tones coming out seemed low freq, less than 400Hz, as though LF hum present.
much different from previous operation as I recall.
Disconnected everything from the PC and the tones from the PC speaker were still Low freq
thought I might have an open ground etc. checked all connections OK
Tone test with the PC only sounded normal.
Started Multipsk for comparison and the PSK31 tones sounded clean and
in the 2k+ freq range as expected.
Is the PSK LF sounding tones normal for WW or am I missing something ?