As a singer-songwriter guitarist who enjoys experimenting with sound, I've found the Pulsar Modular P915 Medusa to be a fascinating and inspiring plugin. I’ve only acquired it a few days ago as a Christmas Gift for being a VIP User. Here's my take on it from a hobbyist perspective:

What is it?
The P915 Medusa is a fixed filter bank, meaning it divides the audio spectrum into 14 fixed frequency bands. You can then boost or cut each band, creating unique tonal shaping and resonance effects. It's not your typical EQ; it's more about adding character and texture.

What I like:
* Unique tonal character: The Medusa has a distinct sound that's hard to replicate with other tools. It can add subtle warmth and presence or create dramatic, resonant sweeps. It's great for adding "vibe" to tracks.
* Simple and intuitive: Despite its power, the Medusa is easy to use. The interface is straightforward, with clear visual feedback. The Performance Bank simply stores snapshots or variations of settings. The Morph is basically for transitions.
* CPU friendly: It doesn't hog resources, so you can use it on multiple tracks without worrying about performance issues.

How I use it:
* Guitar: I started using the Medusa to add body and warmth to acoustic guitar tracks or to create interesting textures with electric guitars. It can help bring out the natural resonances of the instrument.
* Vocals: It can be used subtly to enhance vocal presence or more drastically to create unique vocal effects. This is quite cool.
* Mixing: I've found it useful for carving out space in a mix by subtly filtering certain frequency ranges. I was messing about with Medusa on the Mix Bus and was pleasantly surprised.

This is a useful filter for sound shaping that can be used like a track EQ.
It is an alternative to P422 when you want to bring out the original sound without coloration.
The output of the filter can be switched from the general Wet/Dry method to Dry+Wet/Dry method with the SUM switch, which is good.
This filter does not have an LFO like the P565, but it does have a delay, and it has some unusual features such as the ability to set separate delay times for the upper and lower frequencies as well as L/R, and the ability to move the filter between two points.
At first glance, it may seem like an unassuming filter, but it is my favorite plug-in from Pulsarmodular because it is easy to use and allows you to create your favorite sound without coloration.