I currently have a Kenwood TM-V71A 2m/70cm transceiver that I would like to connect to my Macbook to transmit morse code, using the cocoaModem software. Aside from the cables needed to connect the radio to the Macbook and possibly an external USB sound card, I'm wondering what I need in order to connect a CW keyer to the computer. I don't want to generate CW with the computer, I just want to transmit CW myself with a keyer such as the MFJ 564 iambic dual paddle. Most 2m radios (mine included) do not have a jack into which you can plug a CW keyer, thus my need to connect through the computer.
From what I understand, the paddle does not generate a tone by itself, and it seems to connect through a 1/4" phone plug. Would I need to build my own tone generator circuit that is controlled by the keyer and outputs audio into the microphone jack of the computer? Or would I be able to generate a tone from software and plug the keyer directly into the microphone jack? I'd prefer to buy a tone generator circuit (if one is needed), but I'm not opposed to building one myself from a kit.
Thank you for any help.
EDIT: The other question only applies to Windows as far as software goes, but does refer to 'code practice oscillators', which I think is what I need in order to connect the keyer to the microphone jack and generate an audible tone.