Anything apart from the two mainstream default harmonicas (Solo-tuned fully-valved chromatic, and un-valved Richter 10-hole diatonic). Alternate tunings, different construction, new functionality, interesting old designs, wishful-thinking... whatever!
I recorded a couple of tracks to compare the traditional chord harmonica to the power chord harmonica, but I can't attach mp3 or m4a files. Are there any types of sound files that can be attached to messages in this forum?
To publish a sound file, or any file, the easiest way is probably to upload the file to an online storage service, such as Dropbox or Box. They all have free (gratis) alternatives. You can make the file publicly downloadable. Then you just publish a link to the file, and then anyone with the link can download it. Or play it directly. You can remove the file again at any time. Hope this helps.
Youtube channel: https://www.youtube.com/channel/UCvY8lp ... MDY4xPlRjQ