[sdiy] Drum Pad for Sound Lab'ers

[Roy J. Tellason]

On Sunday 10 July 2005 05:59 pm, WeAreAs1 at aol.com wrote:
> In a message dated 7/10/05 2:48:05 PM, raywilson at comcast.net writes:
>
> << Here is a really simple yet lots of fun drum pad for the Sound Lab.
>
>
> http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/drum_trigg
>er. html
>
>
> Experiment, Have Fun!
>
>
>
> Nice little groove on the audio demos, Ray.  You, sir, have got the funk.
>
> Michael B.

I'm not that familar with the op amp called out in that,  how critical is it 
that the particular one specified be used?  Is this just a FET-input op amp 
or what?