German Amiga developers Virtual Studio released HD-REC for free and it works just fine on AmigaOs 4.x. HD-Rec is the heart of a MIDI studio and allows to handle MIDI and audio data in the same time line editor. The HD-Rec Lite Version is free and has all basic features. For more advanced users, the HD-Rec Pro Version provides 256 tracks, a 16+4(aux)+2(in/out) channel true-stereo audio mixer and a DSP effect library containing essential effects like Reverb, Delay, Chorus, Flanger, Compressor, Parametric Equalizer and more. The plugin interface allows to use software synthesizers as if they where real hardware synthesizers. The main window of HD-Rec is the arranger window. Here you can arrange MIDI and audio “elements” together in the same time line. You can move them around by drag and drop, and perform general operations on them like creating, ex/importing, deleting, cutting, renaming etc., regardless of their type of content, MIDI or audio. The wavesamples and other audio output from plugins are routed into the audio mixer. Every channel can contain “insert” DSP effects, like an equalizer, or send to the aux channels, where “send” DSP effects can be attached, such as Reverb or Delay. Everything is processed in realtime and played back via AHI. Even the AHI input can be used like a normal channel and processed with DSP effects. The main out can also be exported in various file formats (e.g. mp3 or wav) directly to disk, faster than realtime if the CPU is fast enough.