So, I got bored in the last weekend and I developed a new Polyphonic Octave generator for fun. It's a stand-alone Windows program with a very simple GUI.
You can use it with an old TonePort/GX as a "plain" low latency ASIO sound card. Interestingly, I found the default "Line6 GX" to give much worse latency than the ASIO4ALL driver.
Here's a demo by the Oud Master Khalid Najid. Oud is an acoustic fret-less instrument believed to be the ancestor of the modern Guitar
Original Track: KhalidNajid.mp3
Track Processed with my octaver: KhalidNajidOctaver.mp3
Anyone interested in testing this software? Please contact me privately!