Box of Pleiades

Using 3 Pleiades filters of 100Hz, 50Hz, 25Hz, with a switch each (in or out of the parallel bus) the combinations are:

000              flat

001            25Hz

010            50Hz

011            75Hz

100          100Hz

101          125Hz

110          150Hz

111          175Hz

The push buttons could change color when they are pressed so that the binary code would indicate the cutoff frequency.

Interested users may  to buy or wind 1 at a time. Then they could insert them as XLR adaptor plug ins or use them combined on their own without a box.