TEST sending CW MiDi over iP using Gstreamer from 20 wpm to over 100 wpm
create a single SINE WAVE or a single CW AUDIO NOTE using Audacity save as a WAVE FILE...
import into Polyphone Soundfont Editer https://www.polyphone-soundfonts.com/download
EXPORT as a .sf2 file tell the gstreamer fluidDEC element to use that soundfont
NOTE: another option to be able to use a straight key, is to use a single cycle of a pure sine wave ...record via Audacity and import that into Polyphone S.E. (set to loop on Polyphone)