The best Digital Audio Workstation alternative to Spectro is Zynewave Podium, which is free. If that doesn't work for you, our users have ranked more than 10 alternatives to Spectro, but unfortunately only two of them are Digital Audio Workstations.
Podium is a modern digital audio workstation (DAW) for Windows. It supports recording and editing of audio and MIDI, and hosts VST instrument and effect plugins.
Metro is a fast-operating, easy-to-learn high-powered sequencer for the design of professional audio projects. It stands alone as a complete and integrated MIDI, audio and video production system.
Denmark
EU