Song Practice for Bass Players: Hear Every Note of the Bass Line
The bass is the part everyone feels and nobody can hear. It hides under kick drums, blurs on small speakers and disappears completely on earbuds. Song Practice pulls it out of the mix on your iPhone so you can hear what the bassist actually played, then take their place.
Import a song and let Song Practice separate it. Open the Mix sheet and solo bass to learn the line, slow it down with the pitch locked, then pull the bass fader to zero and play along with the rest of the band.
Solo the bass stem
Song Practice uses AI stem separation, on your device, to split a song into four stems: vocals, drums, bass and other. Bass gets its own stem, which is the good news for you. Pull every fader except bass down and the line is on its own: no kick drum masking the root notes, no guitar chords filling the same frequencies, no vocal pulling your attention.
Soloed, you'll hear things the full mix hides. Ghost notes, slides into the root, whether that note on beat four is a passing tone or an octave jump, and how long the bassist really holds each note. Note length matters as much as pitch in a groove, and it's almost impossible to judge through a full mix. For more detail, see how to isolate bass from a song.
Mute the bass and play along
Once you know the line, flip it around. Pull the bass fader all the way down and you have a bassless version of the song with the drums, vocals and everything else intact. Now you're the bass player on the record. Every fader works in dB with a Reset button to get back to the original mix, so you can also leave the bass a few dB under the band as a quiet guide while you're still learning.
You can export that mix as lossless WAV or M4A and use it as a rehearsal track. See how to make a backing track from any song.
Slow down fast lines without the mud
Fast bass lines are hard enough at full speed, and slowing a recording the old way drops the pitch too, pushing low notes into a rumble you can't identify. In Song Practice the speed dial runs from 25% to 200% of the original tempo with the pitch locked in the original key, in steps of 5% of the song's own BPM.
- 50–65% for sixteenth-note funk lines and busy fills, to hear each note and which ones are muted.
- 70–85% to lock the fingering and the right-hand pattern.
- 90–100% to put it back in the pocket.
A single stem stretches more cleanly than a full mix, so solo bass first when you slow things right down. More in how to slow down a song without changing the pitch.
Hear low notes an octave higher
Key shift runs from −12 to +12 semitones without changing the tempo. Shift the song up +12 and every note moves up exactly one octave. The note names don't change, so an E is still an E, but it now sits in a range your ears, and your phone speaker, can resolve. This is the fastest way to tell an A from a B♭ on a low string when the recording is boomy.
The song's detected key is shown under the title, which gives you a head start on the likely notes. See how to learn songs by ear.
See where the bass plays
On iOS 27, Song Practice analyses the song on your device and shows it as a timeline: beats and bar numbers, sections, phrases, the key, and a lane for each instrument showing where vocals, drums, bass and other are playing. For bass players the bass lane is a quick way to spot the breakdown where the bass drops out, the intro where it enters late, or the chorus where it comes back in. Then set your loop around those bars.
Lock in with the drums
Bass and drums are one unit. To practise just that relationship, pull down vocals and other and leave drums and bass up. What's left is the rhythm section on its own, so you can hear exactly how the bass notes line up with the kick. Then mute the bass as well and play against the drums alone. Turn on the metronome if you want an extra reference: it locks to the song's detected tempo and follows you when you slow down.
Export the bass line as MIDI
Long-press a stem to export it. Bass can go out as WAV, M4A or MIDI. The MIDI file opens in GarageBand, Logic or a notation app, giving you a note map to check against what you hear. Bass tends to translate better than dense chord parts because it's mostly one note at a time, but always check it against the recording, especially slides and ghost notes. See how to convert audio to MIDI on iPhone.
Common questions
Can I isolate the bass from any song?
Yes, from any song you can import that is not DRM protected. Song Practice separates it on your device into vocals, drums, bass and other, and you can solo the bass stem, mute it, or export it as WAV, M4A or MIDI.
How do I make a bassless track to play along with?
Open the Mix sheet and pull the bass fader all the way down. Vocals, drums and other keep playing, so you take the bass part yourself. You can export that mix as a WAV or M4A backing track.
Why shift a bass line up an octave?
Low notes are hard to pick out on phone speakers and earbuds. Shifting the song up 12 semitones keeps every note name the same but moves it into a range where the pitch is clearer. The tempo does not change.