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It did take quite a while for the last batch to be sent out, then for some people 2 months of shipping on top. Enough people asked if they could pay more for faster shipping that he made it an option for the latest batch, but at that point none had been built from that batch. A few weeks ago (easter weekend i think) he showed boards and parts had arrived and he was starting to build that weekend, but this is one guy building and testing by hand in his spare time. Im sure he will be in touch soon with an update

No need to be sorry, i was just answering as i know seb is constantly busy. In theory yes the teensy has digital to analog converters built in so you can do it, but right now you would have to code it yourself, its not going to be as easy as just soldering a part in. Seb has provided the full code so if you wanted to you could add it yourself. But you do need to learn to walk before you can run. Get a teensy or arduino, some basic components like leds and pots and work your way through some tutorials.

Arduino has been around longer, and you can run arduino code on a teensy-you just need to be aware of the different pin layout. There are quite a few teensy projects but TBH youre more likely to find examples with arduino, its probably the most popular microcontroller out there. Their website is full of tutorials and they have a friendly active user forum. Im not saying buy an arduino instead of a teensy, im saying look for someone who has made for example an arduino sampler, study the code and apply it to your own project.

Most people starting out with microcontrollers will take someone elses examples and just modify the code/circuit to see what happens. It may seem a little daunting at first, but honestly it is alot easier than it seems and is really rewarding.

Looks awesome. I cant find my megadrive scart/phono cable so ive just added an audio out jack to my megadrive 2. Its not a prosound mod (search for crystal clear audio mod megadrive) but its good enough. Theres space to put an 1/8 inch jack at the back left or right, although the right might need some extra plastic removed. I opted for mono due to lack of spare interface channels.

http://www.mmmonkey.co.uk/mega-drive-2-av-port-pinout/

Remove all screws to get the plastic casing then metal ground shield off, then the screws either side of the cartridge port in order to lift the pcb out of the case. At the underside of the av port solder a wire to one of the 4 larger tabs, this is your ground cable. Then either solder one cable to pin 6 for mono or a cable each to 8 and 9 for stereo (see link). The cables can be threaded through the pcb mount holes then the pcb and ground shield screwed back on. Mount your jack to the case, careful to place it so the contacts wont be touching the ground shield-i drilled mine in the top half of the case. Solder the wires to the jack(s) and close the case

I know you are a busy man doing all this work in your spare time, so no pressure.  But the previous post about using a single port and possibly the same pcb as genmdm has stopped me from building my own - for now.  I have a flash cart and prosounded 2600jr opened up and waiting for the next rev of modifications

Great news. Out of interest what have you done about power supply with the din connection, are you getting 5v from the sega? As someone else pointed out earlier, ditching the usb supply has really reduced noise for me

Presumably its just to ensure the processors got a stable supply, which would probably cope without. Not much point me removing it if im putting an arduino in as that needs 5v regulated anyway