Taken form their website:
KRISTAL Audio Engine is a powerful multi-track recorder, audio sequencer and mixer – ideal for anyone wanting to get started with recording, mixing and mastering digital audio.
It is designed as a modular system. The main application provides a mixing console, while the audio sequencer, live audio input and so on are loaded as separate Plug-Ins.
KRISTAL Audio Engine is free for personal, educational and non-commercial use.
For commercial use we offer the following licensing options: 
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| License type | Price/User | |
| KRISTAL single-user license | 24.90 EUR | Buy now! |
| KRISTAL multi-user license (5 users ++) | 19.90 EUR | Buy now! |
| KRISTAL multi-user license (10 users ++) | 14.90 EUR | Buy now! |
- We grant a trial period of 30 days. Please try before you buy!
- Simply download the KRISTAL installer and legitimate it for commercial use by paying the license fee.
- You will receive a personalized License Key via E-mail.