As now the tracker has a lot of nice engines, but being a retro device of sort, since it does appeal to us old geezers that used a tracker on an Amiga or Atari, I thought that it could be great to see a SID engine onboard.
Other devices that compete in a way or another with the tracker does have one; so it would be quite appealing to have this onboard to make patches you could technically play on your C64 SID chip (or hardware related SID synths), and also extra points for playing SID files, as we can load and play MOD/MED files.
If the ecosystem of the Tracker was open I would write my own engine to be honest, but sadly it is closed source so nothing can happen unless there is interest, and I am curious to see how many people would like to see a SID engine that can read SID files and can make patches as other synth engines.
It is not for everyone, I know, and honestly I would give up one of the existing engines on the tracker to swap it with a SID engine
I was looking at existing products but I am not interested in a sample based solution; I did sample my original C64 with the music cartridge years ago, and it works if all I want is some old sounds, but to make new sounds you need the whole implementation.
I have a bare SID on a breadboard connected to an audio amplifier but it is a pain to use as you have to write on the registry as the 6502 CPU would do on a real C64; so I started to look at software alternatives, considering that other devices like the tracker can run a sort of a SID synth in software without using samples.
Tracker is using Teensy 3.6 as core; as the Tracker + and mini are using a variant made in house by Polyend, which could be a derived architecture still based on ARM Atmel; but in the end it is an irrelevant detail. What matters is that the plus and the mini are more powerful, so if a teensy 3.x can run a SID emulator, I would assume the plus and mini have enough power to run it