Aalto Solo is a fantastic semi-modular synthesizer by Madrona Labs, released as freeware in January 2013. It is basically a monophonic version of the acclaimed Aalto virtual instrument.
You’ll need to register for an account at Beat Drive, but the process is easy and completely free.
It’s easy to spend hours upon hours experimenting with this awesome freeware synthesizer. You’ll have loads of fun exploring all the possibilities and come up with some intriguing sounds in the process. Get Aalto Solo right away if you’re a modular synth fan and get ready to find yourself lost in the magical world of intoxicating patches and endless flows of modulation sources.
Source : studiodrive.de