Analogue systems

Would you be interested in a 4HP module with one attenuator and one
slew, for 30 USD?

After having been very pleased with a DIY project, I want to see if I
can spread the happiness.  I would like to gauge interest and sales
potential for the following:

A module consisting of two independent circuits, drawing 0 mA from
your system.  The circuits to choose from are:

1) Attenuator.  One level knob.
2) Simple RC filter (lowpass).  One frequency/period knob.
3) Simple highpass filter, ditto.

My favorite idea is to combine 1 and 2.  The filter can be used to
shape audio signals, but it will not sound as good as a powered LPF
like the RS100.  The main idea is to make the range of the cutoff
frequency very low so that it acts as a slew module or an ASR
envelope.  This actually works very well.  You can get a soft attack
and a very natural, acoustic sounding release, straight from your Gate
signal (or a rectangle wave).

I doubt there would be much interest in circuit 3.  But let me know
what combinations you would want, i.e. 1&2, 1&1, 2&2, 2&3, etc.

I could put these into a nice, printed 4HP panel and sell them for
probably around $30 a piece.  Any takers?

Monroe