Auto-Level
One click measures the mix and raises it to −1 dBFS peak level — studio loudness without the math.
Audio Stem Mixer · in the browser
Your track.
Your cut.
Perfectly matched to the picture.
For SIDtunez tracks with stems available, you mix the royalty-free individual tracks yourself in the ASM: adjust stems, cut clips with automatic crossfade, overlay your own video as a reference — and license the finished mix as WAV, with no fees to GEMA or GVL.
No software required · Video stays local · Preview sounds like the purchase
The SIDtunez ASM is a browser-based stem mixer that adapts a track's available individual tracks (stems) to the length and structure of your project. Instead of using a track as is, you decide for yourself: lower the drums, remove the vocals entirely, shorten the intro, time the drop exactly to the scene change — while your own video plays as a reference right above the tracks. What you hear in the preview is exactly the file you'll license in the end.
Stems
Arrange Each Track Individually
Many tracks are available as individual tracks — e. g. drums, bass, melody, and vocals. Each track has volume, mute, and solo.
- Instrumental for voice-over: mute vocals, done
- Pull back the drums when the narrator needs to be louder
- Solo to quickly listen into a track
Edit
Cutting without clicks
Split, move, overlap clips at the playhead — every cut automatically gets an inaudible crossfade, just like in a real DAW. Drag the handles on the clip corners to fade in and out.
- Shorten the intro, place the drop on the scene change
- Loop passages with Ctrl+C/V
- Every step can be undone with Ctrl+Z
Video reference
Your video above the tracks
Load your video as a filmstrip track with a preview window — frame-accurate sync to the playhead. This lets you cut the music directly to your picture.
- No upload: the video stays local on your computer
- No storage, no waiting — even with large files
- Movable, with an original audio toggle
And the studio tech? Runs right along.
Levels, curves, and limiter are handled by the ASM in the background — you focus on the edit.
Safety Limiter
Protects against clipping — in the preview just as in the purchased file.
Detail Zoom
Timeline down to the millisecond, the waveform stays razor-sharp.
60 Steps of History
Ctrl+Z undoes any action — from the edit to the fader move.
Buy as WAV
Your edit is rendered with all fades and levels and licensed the standard way. The preview is the purchase.
Your own mix in three steps
No setup, no software — just a current browser.
1
Choose a track
Pick a track with stems from the catalog and open the ASM directly from the player. The tracks load in the browser.
2
Customize
Adjust stems, split, apply fades — with your video as reference if needed. Click the timeline to jump to any point.
3
Level & purchase
Auto-leveling brings the mix to studio volume, then your edit is rendered as WAV and licensed as usual.
In 48 seconds
The ASM explained briefly
Mix individual stems, cut, bring to level — and license as WAV.
What the ASM is made for
Wherever music can't just play, it has to sit.
Commercials & Social AdsBring the track to exactly 15, 20, or 30 seconds — with a clean ending instead of a hard cut.
Image Films & YouTubeShorten the intro, place the peak on the scene change, pull the outro into the credits.
Speech & Voice-overLower or mute the melody or vocal track so the dialogue carries.
Podcast Intros & JinglesBuild a matching short version from a track and reuse it.
Event Films & WeddingsAdapt the music's dynamics to the edit instead of the other way around.
Agencies & ProductionsVariants of a track for different formats from a single license source.
Frequently Asked Questions about the ASM
Is my video uploaded?
No. The video stays entirely on your computer and is only displayed locally in the browser — no upload takes place, and nothing is stored or processed. That's why even large files start instantly. After closing the mixer, simply select it again next time.
Does the purchased file really sound like the preview?
Yes, because both go through the same signal chain: the same levels, the same fade curves, the same limiter. The WAV export is not a re-creation of your mix — it's the same mix, just rendered in full quality.
Do I need to budget for GEMA or GVL fees for using it?
No. SIDtunez's entire catalog is royalty-free and GVL-free — not registered with GEMA or any other performing rights organization (PRO), for either composition or performance rights. So no GEMA or GVL fees apply to your licensed mix.
Is the finished ASM mix also GVL-free?
Yes. The mix is created from the stems of a royalty-free and GVL-free track and remains so. SIDtunez has contractually confirmed GVL-free status with the performers and rights holders involved. Upon request, you'll receive a confirmation of royalty-free and GVL-free status for submission.
Do I need prior DAW experience?
No. If you've ever edited a video before, you'll feel right at home: timeline, playhead, dragging clips. The studio technology — crossfade curves, levels, limiter — is handled automatically by the ASM in the background.
What do I need to get started?
Just a current browser. You can try it out without signing up; a free account is required for the video reference track and to purchase the mix.
Make the track your own.
Choose a track with stems and open the ASM directly in the player