Diode substitute in an amp switch

[sjaustin]

I'm replacing a 3-button switch for a Bogner Shiva, and wanting to make sure I get a diode that works right. Pretty sure its only function is to isolate the signals from the different footswitches. It appears to be a 1N4728A, which I don't have on hand, but probably something else I have would work fine. Any recommendations for subs?

[somnif]

Seems odd they would use a zener for an isolation job, but it could be I suppose. 3.3V 1W zener, if you have anything in that range.

That said, you can get one for 6 cents with free shipping from Arrow if you want a direct swap.