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Get battery in there as quick as you can! There's a small capacitor which will hold a charge for some time without a battery, however it will dry up quickly. As for the RAM test failure, I've seen that happen on EMS's and I have some theories, but nothing proven.

Batsly and TSC: Jose violated copyrights for profit AND ripped people off. The goal here is to get revenge for someone who ripped people off, and violating copyrights in order to do that. And presumably spreading the reverse engineered version as public knowledge and, and selling any copies for the production price.

Now, I do have my doubts about this project, and in both of these cases (Both x|k and actually Jose) I'm seeing people who were probably desperate to try to make money to make ends meet, rather than get rich quick. But the situations are not equivalent. They just aren't.

Check if the rechargeables are actually reaching the contacts. This might sound silly, but some batteries are slightly out of tolerance, so that the peg sometimes doesn't reach the battery contact.

By "not even a glimpse", I'm assuming you mean not even a little crackle in the speaker, not even a little dirt on the screen, and not even a faint flash from the power LED.

SRAM: It's a possibility, but I think the use for that would be marginal. I think people generally have a way of flashing ROMs normally onto their cartridges. Maybe for use with non-EMS cartridges (ie catridges that lack native multi-ROM support) but that's not a priority, I guess. One use for this could be to allow the user to remove the cartridge while the program is still running in the Gameboy's RAM. In theory that's a good idea. In practice, only GBC can do that without immediately crashing.

Channels, any of them, as used by the patches. How many sounds, as many as possible.

The microphone is likely an electret microphone which needs to be biased, meaning it needs a voltage across it. Your laptop does this by default, but Monotribe probably doesn't.
You could look here for example:

http://circuit-diagram.hqew.net/Battery … _2671.html

That circuit is a bit overkill. you can simplify it as follows: Leave out everything except R5 and C1. Connect the other terminal of the capacitor to the output, ie the tip of the jack.
R5 should be something between 4.7k and 10k.
Vcc is the positive terminal of some battery arrangement such as 3-4 AA batteries in series, or one 9V battery. The negative battery terminal goes to ground.
C1 should be something between 1 uF and 4.7 uF. The positive side of the capacitor should be connected "up", and the negative side "down", ie to the output.

Or connect it through the mixer. That's totally cool as well.

Oh and this might be if interest as well:

http://www.youtube.com/watch?v=DXYdeTpeosw

I want the focus of the program to be live playability, so probably only controllable through the buttons. Full disclosure, I'm even hoping to sell this as a cartridge in the future (as well as being a free download.) As for submissions, as long as I can reproduce the sound, it doesn't really matter. I'm expecting a lot of these patches to be layered across channels and maybe using channel 3, so sav/lsdsng might be easier.

Yes, that is one of the points of making this ROM.