Well, we can't know what exactly you're downloaded. Maybe you got the source code instead of the binary.
I guess you need this one: http://hertzdevil.info/programs/0CCft_v0315r3.7z (latest Windows binary release in the official repo).
When you create a new instrument, it opens up a UI, which changes depending on which sound engine you created it on. For example, the guitar sound instrument opens up a menu primarily including a waveform editor, you draw the waveform in, then set modulation settings. It's not primarily for guitars, but it can be. The more recognizable 8bit ones have tabs for Volume control, arpeggio, pitch/detune, hi-pitch which is just an aggressive version of pitch, and 3 different waveforms.
Also this isn't my version specifically, but a link to the most well-used fork, http://hertzdevil.info/programs/
It is!
http://hertzdevil.info/programs/
Big learning curve as there would be for most music software, but I feel like even after learning a good bit of the Reaper DAW, my FamiTracker workflow is way more fluid and efficient.
THanks for the reply! yeah, Famitracker is a reference for NES music, I know a thing or two about it even without know how to make music. Have you tried HertzDevil's fork of FMT which allows for multiple modules? It could be handy.
Honestly, I enjoy any kind of 4/8 bit chiptune, they all have their particularities that makes their sound unique and that's the best thing about the platforms.
I'll keep an eye over your videos and will wait for a release, don't forget to include everything, okay?