need more inputs & outputs to run tape machines

I think you should check pro-audio sites and stores for a mixing-type console. 

swampwalker has the right idea.

I wonder though if it would make sense for you to all-our on a 16-20 channel mixer (mackie makes some great ones) unless you think that you'd benefit from adjustable level, gain and EQ per channel.

One thing I think I would consider is making my own.  If I understand your ultimate setup, you'd have 20 stereo inputs and 20 stereo outputs on the tape side but only a single input and single output on the source side. In other words, all 40 I/Os would be wired in parallel.

Theoretically you could build one pretty easily (project enclosures are easy to come by as well as all necessary parts) and I think I would forego any switching capability to simplify the build - Of course that means that all inputs and outputs would be active all the time, which might be handy for you.

It's interesting that you're looking for such a solution since I don't think I've ever heard of anyone needing to do this (unless you're in the tape duplication business) which would explain why there isn't an obvious off the shelf solution

Good luck

Greg

Hi Greg,Thanks for your help,that is exactly what i am looking for ,something passive with no controls.I am not very good with solder iron & was hoping there was something out there like this,so i could keep my tape recorder collection hooked all the time,maybe something even with 20 inuts & 20 outputs with a button to select 1-20 for each recorder.Maybe someone would want to build me one & i would of course pay them to make it.

Here is an 8 way switch.

http://amzn.to/2mB5CjU

Best,

E

Thanks for the link Eric,that is what I need,but also need the outputs,maybe I could buy 2 & use one for inputs & one for outputs,seems like that would work ?