Cool. Amsterdam. Have fun.
You're right, I find recording and gear endlessly fascinating.
I'm a Tascam fanatic, analog purist, and vintage gearhead. The 246 is one of my favorite 4 track Portastudios, and I have one, but it is not my primary recorder. I'm not as intimately familiar with the 246 as I am with some other models, so I can't quote "this switch here, that button there", etc, but I'm an experienced 4 track Portastudio user, open reel and the 388 too.
In general, you can put effects on each channel, 1-4, independently, by using the INSERT jacks, which are stereo/in/out jacks. You'd need an appropriate stereo adapter cable. In this case, the signal passes out of one side of the INSERT connector, through the effects box, and back in, through the other terminal of the same INSERT connector.
The other method, would be to use
the AUX 1/AUX 2 outputs, to pass a stereo signal out to your effects, and [like you say], bring back the stereo-effect-return through the channels 5 & 6 inputs.
If properly patched and configured, this should work. This would enable you to listen back/mixdown your 4 track material, while passing a stereo AUX 1/2 output to an effects box, back in on channels 5 & 6, and summed together again onto the main L/R stereo buss. This brings your raw tape signal and your effect signal together in stereo, then line-out & record to another device.
I hope this advice helps you in your recording scenario.
- I know what you mean, about being paranoid about theft of such a nice recording device as the 246. If you're leaving the country, you're using good judgement, not being paranoid, by storing the 246 away as safely as possible. This is a world where shit happens, and people do crappy things to each other.
- I remember, in '82, when I got my 244, and in '83, when I got my 38 and M30, I was VERY paranoid about having them stolen! I had them locked in a double-size closet, and alarmed! I pulled all the gear out to use it, and put it back when I was done! Haha. No lie! I didn't live in the 'best' neighborhood, either, at the time, haha.
Now, I'm in a room with EVERYTHING in it, like $20,000 worth of stuff, and I'm not paranoid at all! Time changes everything.
-Have a nice trip, and good luck with your recording.