Using SYNTHEDIT, http://www.synthedit.com/,

I was able to make a VST plugin (VSTi plugin would be more accurate since it is a synthesizer plugin) that acts just like a hardware CODE PRACTICE OSCILLATOR, only this one is keyed using MIDI INPUT

NOTE:   [ there are several versions of the sineCW vst plugin available to test in all the attachments below ]

This sineCW vsti plugin is keyed using a MIDI INPUT, which acts just like a normal rig would being keyed with cw keyers.

There is an ongoing article about  MIDI KEYED CPO in the Blogs

http://qrqcwnet.ning.com/profiles/blogs/midi-keyed-morse-code-sine-...

HERE is an example of the waveform showing a dit using this plugin:

Here below is a picture of the setup...using a VST HOST...and being keyed using AUDIO to MIDI technique  ~ an 18 khz wave from a 555 chip goes into the MIC JACK,  this triggers REAGATE to send a midi note of any pitch you choose, to the input of the sineCW3 vst plugin, which keys just like a normal CPO, and then the output of sineCW3 goes to a final BANDPASS filter where you can adjust it to remove any remaining cw note edge noise and also determine how narrow you want the cw tones  - audio bandwidth -  to be...

NOTE:  CLICK ON PICTURE for large FULL SCREEN VIEW

If you take a look at the PLUGIN GUI, you will see several parameters.  The most important are the ATTACK and RELEASE....which sets the RISE and FALL time of the cw note.  The 2nd to last PATCHVALUE is also interesting,  you can vary the "hardness" of the keying by selecting one of the other options here,  ie   EXPONENTIAL .   Send a cw file and adjust these 3 parameters while listening LIVE,  to get everything set to your desired sending cw "sound"

NOTE:

Please find attached the download link if you are interested in testing this VST PLUGIN on your computer system.  This is a 32 bit only VST PLUGIN.  Place this dll file into your VST 32 BIT folder and rescan your VST HOST to pick it up...

HERE IS AN EXAMPLE OF HOW THIS HOME BREWED VST CPO SINE WAVE CW OSCILLATOR sounds when sending cw at qrq speed 80 wpm....from TOM, W4BQF's article - COPYING CW OVER 70 WPM.

HERE IS A LIVE DEMO OF USING PADDLES with this VST PLUGIN CPO