Push Freezing on Auto Shift: The Fix, and Using It for Bass
Push Was Freezing on Auto Shift — Here's the Fix, and How to Actually Use the Device for Bass
If you've had Push 2 or Push 3 lock up mid-set while running Auto Shift, you weren't imagining it. Ableton quietly patched it in a recent beta, and it's a good excuse to look at what Auto Shift actually does for low end — because most of the coverage it got when it launched was aimed entirely at vocals.
The Bug, and the Fix
Live 12.4.15b5 (released September 30, 2026) shipped this line in the Push release notes, word for word:
"Fixed an issue where Push 2 and Push 3 would freeze when using Auto Shift."
That's it — no further detail on triggers or reproduction steps, which is typical for Ableton's beta notes. But the fact that it needed its own line item tells you this wasn't a rare edge case. If you run Push 3 in Standalone Mode, or use Push 2/3 as a controller while Auto Shift is loaded on a track, a freeze mid-performance is about as bad as a bug gets — there's no graceful recovery, you're just stuck.
The fix is currently beta-only, in the 12.4.15 beta track (as of this writing, the beta sits at 12.4.15b6, released October 8, with no further Push-specific changes since). It hasn't landed in a stable release yet — the last stable Live/Push build is still 12.4.6 from September 15. If you're running Push hardware and lean on Auto Shift at all, this is a reasonable case for opting into the beta program rather than waiting, since the freeze itself is already fixed and sitting there.
This is a separate issue from the dry-signal latency bug we covered when it was fixed in Auto Shift's Bass Pitch Range toggle (see our earlier breakdown of that fix) — that one affected the audio signal path on any platform. This one is specific to Push hardware freezing, not a correction-quality issue. Worth knowing both exist if you're troubleshooting Auto Shift behavior.
What Auto Shift Actually Does
Auto Shift shipped in Live 12.1 as a real-time pitch tracking and correction device, and it ships in every edition of Live — Intro included, not gated to Standard or Suite. Most of the marketing around it leaned hard into vocal correction, which makes sense: that's its most obvious use case. But the device description is explicit that it works on "any monophonic audio signal," and a bass line — assuming it's not stacked with harmonies or double-stops — is about as monophonic as audio gets.
The device does four things at once: pitch correction (quantizing to a scale or to MIDI notes from another track), pitch shifting, formant shifting, and vibrato, with a built-in LFO for modulating any of that over time. You don't have to use all four — you can run just the pitch/formant shifting with correction turned off, for instance.
The Bass Pitch Range Toggle
In the Input section, three toggles — High, Mid, and Bass — tell Auto Shift what frequency range to expect from the incoming signal. This isn't cosmetic. Each setting changes how the device's pitch-estimation algorithm weights the incoming audio, and each one affects the device's overall latency differently, so switching between them mid-session will shift your round-trip latency. An LED next to each toggle flashes when incoming audio falls into that range, which is a quick sanity check that you've picked the right one before you start tweaking anything else.
For a bass track, set this to Bass before touching any other control. Running a sub-heavy signal through the Mid or High setting is the single most common reason pitch tracking on bass sounds unstable or glitchy — the algorithm is tuned for a frequency range the signal isn't actually in.
Mono Voice Mode Is the One You Want
If you enable MIDI input — routing a separate MIDI track into Auto Shift as a sidechain source instead of using the Quantizer's fixed scale — you get a choice between Mono and Poly voice modes. Poly can harmonize up to eight voices at once, which is the headline feature for vocal use. For bass, you want Mono: a single voice, one note driving the correction at a time, which matches what a bass instrument is actually doing.
Mono mode also exposes a Glide slider, which sets how long overlapping notes take to slide from one pitch to the next. This is the control that turns MIDI-driven bass correction from a quantized, robotic snap into something closer to a fretless slide or a synth portamento — useful if you're correcting a DI'd bass performance but want to keep some of its natural movement between notes.
One thing to flag if you go this route: when MIDI input is on, Auto Shift only produces sound when it's receiving MIDI notes. It's not a passthrough-plus-correction setup at that point — the MIDI track is driving whether anything comes out at all.
Live Mode, for When You're Actually Performing
The device's title bar has a Live Mode toggle, separate from the input toggles. It trades a bit of correction stability for lower latency — Ableton's own documentation notes that "slight glitches may occur during note onsets or rapid pitch changes" when it's on. For a mixing or production context, you'd normally leave this off and let Auto Shift take the time it needs. But if you're running Auto Shift live on a Push 3 standalone bass rig — correcting a bass guitar or synth voice in real time in front of an audience — that latency is exactly what you're trying to avoid, and the occasional onset glitch is a worthwhile trade.
Combine Live Mode with the Bass Pitch Range toggle and Mono voice mode (if you're using MIDI sidechain correction), and you've got the lowest-latency, most bass-appropriate configuration the device supports. Watch the Latency Readout in the Input section while you dial this in — it updates live as you change settings, so you can see exactly what each toggle costs you before you commit to a setup under performance conditions.
A Formant Trick Worth Knowing
Separately from pitch correction, Auto Shift's Pitch section includes independent Pitch Shift and Formant Shift controls, which work whether or not correction is active. Formant Shift moves the resonant frequencies that define a sound's tonal character without touching the actual pitch — push it negative and a sound reads as lower and "less full" even at the same note. On a bass synth voice, a small negative formant shift (try starting around -10 to -15%) can make a part feel heavier and more low-end-forward without actually dropping it an octave, which is a cheaper trick on CPU and transients than re-recording or re-pitching the source.
The Formant Follow slider controls how much of that formant movement tracks any pitch shifting you're also applying — turn it up if you want a more natural-sounding transposition when you do move the actual pitch, turn it down if you want the formant character to stay fixed while the note changes.
The Takeaway
If Push froze on you while running Auto Shift, that's a confirmed, fixed bug as of beta 12.4.15b5 — update if you're affected and can run betas. Beyond the fix, Auto Shift is worth a second look as a bass tool specifically: set the Bass Pitch Range toggle first, use Mono voice mode (not Poly) if you're driving it with MIDI, and reach for Live Mode only when you're actually performing in real time rather than tracking in the studio. For more on the device's correction-quality fix and the broader Bass Pitch Range context, see our earlier Auto Shift breakdown; for another pitch-manipulation device worth knowing on bass, check out Shifter.