I am beginning to understand better. Here is yet another idea:

If you don't need to get every pulse on every channel then you could do
something like this:

1: wire the four channels to RB4, RB5, RB6 and RB7 via a 10K resistor.

2: TRIS RB4 as an input and RB5, RB6 and RB7 as outputs

3: Use interrupt on change to get the first channel.

4: TRIS RB5 as an input and RB4, RB6 and RB7 as outputs

5: Use interrupt on change to get the next channel

etc.

Note:

The 10K resistors make sure that you don't get a collision  when a pin is
driven as an output.

Pins set to outputs do not participate in interrupt-on-change.

Bob Ammerman
RAm Systems

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