Set the project tempo in BandLab Studio

Open the project in Studio and locate the tempo or metronome controls in the transport area. BandLab's current Help Center explains that the metronome menu on web provides Tempo, sound, volume, and count-in settings; mobile exposes the corresponding controls through Studio settings. Enter or adjust the target BPM, then turn on the metronome to hear the new project grid.

This establishes project timing. Virtual Instrument and MIDI material lives on that grid and is the easiest material to expect to follow. Loops selected from a tempo-aware library are designed for project use. Recorded or imported audio contains fixed samples and may require stretching or manual region work. Duplicate the project before testing a major change, especially when collaborators have already edited regions.

Audit tracks before changing BPM

Label each track as MIDI or Virtual Instrument, BandLab loop, recorded audio, imported audio, or one-shot. Note any audio that must retain natural timing, such as a voice, acoustic guitar, or full mastered song. Save the original BPM and export a rough reference if the arrangement is important. This creates a recovery point and makes changed timing easier to compare.

Check the first downbeat and trim state of imported files. BandLab notes that imports may include a few seconds of silence at the start as part of its import handling, with the original start indicated in the region. Leading space can make a correct tempo appear late. Align musical beat one deliberately before diagnosing BPM or stretching the region.

Use Timestretch Mode for audio regions

BandLab documents Timestretch Mode for changing an audio region's duration without changing pitch. On web, enable Timestretch mode, then drag the region's end handle. On mobile, select the region, open its additional options, choose Timestretch, drag the end, and confirm. Interface labels can change, so use the official Help Center page for the current placement.

Dragging to an exact musical boundary is more reliable when you know the source bar count. For example, a four-bar loop should begin on one bar and end exactly at the next fifth-bar boundary. Turn on snap while targeting the grid, then listen with the metronome. Disable snap only for a deliberate fine adjustment; visually filling a space does not prove internal beats align.

Use AudioStretch when speed and pitch need separate control

BandLab also documents AudioStretch, especially in its mobile app, as a tool for changing playback speed and pitch. This is useful for transcription, practice, or creating a modified file, but speed percentage is not automatically the same interface as entering a target musical BPM. Calculate the required ratio from original to target tempo and make a controlled change.

A speed change can alter duration and may affect pitch depending on the chosen controls and workflow. Confirm what the preview is doing, keep pitch at its intended setting, and apply only after listening. If your requirement is to keep a multitrack arrangement synchronized, region-based project editing is usually clearer than processing an isolated file and guessing where it belongs afterward.

Understand what a tempo change cannot guarantee

Time-stretching reconstructs audio over a new duration. Large changes can blur drums, produce a granular or watery texture, and make vocals or ambience pulse. There is no honest universal threshold at which every source remains transparent. A clean one-bar drum loop and a mastered stereo mix behave differently even at the same percentage change.

BandLab's project controls also do not turn a live, drifting recording into a perfect fixed-tempo performance by magic. If a region aligns at the start and drifts later, verify its actual tempo and whether it changes. Split and align sections only when musically appropriate. Keep the unprocessed source and avoid repeatedly stretching a render, because multiple generations make diagnosis and recovery harder.

Verify every region against the metronome

Start at a clear downbeat and play at least several bars with the click. Check again in the middle and near the end. If every other click matches, test a half-time or double-time interpretation. If the click has the right rate but lands between beats, fix the region's start phase. If it steadily drifts, the source BPM or fixed-tempo assumption is wrong.

Solo important audio to hear stretching artifacts that a full mix can conceal. Listen to consonants, cymbals, drum attacks, and sustained notes. Then play transitions where a stretched audio region meets MIDI or a library loop. A visually aligned waveform can still contain a weak pickup or internal timing that makes the musical join feel late.

Export a tempo-changed BandLab project safely

Once the arrangement passes the full listening check, export using BandLab's current mixdown or download workflow. The rendered waveform contains the actual timing result. Writing a BPM in a filename or tag does not change audio speed. Reimport a short export into a blank project at the target BPM and check its first and later downbeats.

Preserve the original project and name the new version with original and target BPM. Tell collaborators which regions were stretched and whether the project uses one fixed tempo. BandLab is updated frequently, so consult its Help Center if controls differ from screenshots. Documented behavior is a stronger basis for a production decision than assuming every region follows the transport automatically.