I tried to find a way to transmit CW using a LimeSDR Mini and SDR Console. Until now I used an external tone generator (600 Hz), keyed externally with my electronic keyer (ETM-9COG).
After searching the internet for a while I found tool called "Morse Keyer 4.3". This software makes use of a serial interface (RS232 or USB to TTL converter) as a keyer input and produces an adjustable tone that can be put on any of the installed (real or virtual) sound devices of your computer. I use the software with Windows 10.
The tone frequency can be adjusted, as well as the softness rise/fall time, to avoid clicks (see screenshot).
Resources and download:
I connected my electronic keyer output directly to the pins marked "Manual Key", see picture (source: MorsePower Website).
For SDR Console, I use the SSB function with VOX enabled and the Virtual Audio Cable (B) as input.
Have fun, see you on CW!
Holger 'Geri', DK8KW