While not free, it offers an indefinite, "fully functional" evaluation period for a very low cost.
Install the program and select the "Free Version" option during setup. Limitations of the Free Version free mixpad registration code
Layer music, vocal, and audio tracks.
The free edition is quite robust but lacks some features found in the Pro version, such as: Support for more than 12 tracks. Commercial licensing rights. Some advanced VST and MIDI capabilities. Best Alternatives to MixPad While not free, it offers an indefinite, "fully
If the free version of MixPad doesn't meet your needs and you aren't ready to purchase a license, consider these open-source alternatives: While not free