Support

Mic Bleed Remover — separate two voices recorded on two microphones

Getting started

How do I clean a recording?

Add both microphone tracks — or the single dual-channel file your wireless kit made. The App lines the two recordings up, finds the worst moment of bleed in the session by itself, and plays it to you with a measured figure. Press and hold to hear the original at the same instant. When you are satisfied, export both cleaned tracks.

What can I bring in?

M4A, WAV, MP3 and AIFF audio, and MP4 or MOV video, from Files, the share sheet, Photos, AirDrop or an SD card reader. Two phones running Voice Memos works. So does a phone plus a lav recorder.

My wireless kit recorded one file, not two

That is the normal case for a dual-channel kit in split mode: one file with a speaker on each channel. The App recognises that on its own and treats the two channels as two microphones — it will not ask you for a second file.

The two recordings do not start at the same moment

They never do, and they are not expected to. The App finds the offset itself and tells you in plain words — “Ben’s mic starts 12.4 s after Ana’s”. It also corrects the drift between two independent clocks continuously across the session, which matters more than it sounds: two recorders that each keep their own time can slip by a noticeable fraction of a second over a couple of hours, and an alignment that is right at the start is wrong by the end.

The two files can even arrive minutes apart. Add one, add the second when you have it, and they are paired then.

Do I need a connection?

No, and there is nothing for one to do. The App has no networking code in it at all — it works in Airplane Mode exactly as it works otherwise.

When the result is not what you expected

What does the dB figure mean?

How far down the other person’s voice came on that track, measured on a stretch where only that person was talking — so it is a measurement of the bleed itself, with none of the track owner’s own voice mixed into the number. It is measured on your own recording, not quoted from ours.

I can still hear the other person in places

Look at where. Stretches where both people talk at once are the hard case for this kind of processing, and they are where any residue is most likely to survive. Where one person is talking alone — which is most of a normal conversation, and all of what you need for gating and editing — is where the App does its best work and where the figure is measured.

If it is not enough, try Strong and compare. Strong removes more, and can take a little body from the voice you are keeping, which is exactly why the press-and-hold comparison sits above the control.

The voice I am keeping sounds thinner than the original

Drop to Light, which subtracts what the other microphone predicts and stops there. Compare with press-and-hold before you decide: the whole point of that control is that you judge it on your own recording rather than trusting a setting name.

Which strength should I use?

Standard for almost everything. Light when the voice you keep matters more than the last of the bleed. Strong when the bleed matters more. Light and Strong are Premium controls; the free tier cleans at Standard, and Standard is the setting every published measurement was taken at.

It cannot line my two recordings up

The two tracks have to be the same conversation, recorded at the same time, with a stretch that genuinely overlaps. Two takes of the same interview, or two recordings that barely overlap, give it nothing to match on. If the overlap is real but short, the App tells you how much of the session it covers, and the audio outside the overlap is passed through untouched and labelled as such.

Files, exports and the free export

Where did my exported files go?

Wherever you sent them from the share sheet — Files, AirDrop, or straight into your editor. They are also kept inside the App, at Files ▸ On My iPhone ▸ Mic Bleed Remover ▸ Clean, in a folder for that session, so dismissing the share sheet does not lose the files you just made.

Both are named after your speakers — Ana (clean).m4a, Ben (clean).m4a — and keep the original length and start offset, so they drop back into an editor in the right place.

My tracks are called “Left mic” and “Right mic”

The App takes speaker names from your filenames when it can — Ana.m4a becomes “Ana” — and falls back to the neutral label when it cannot, rather than labelling someone “REC001”. A file named after your recorder, like DJI_01.WAV, gives it nothing to go on. You can rename the speakers yourself.

How does the free export work?

One full export — both tracks, full length, full quality, no watermark — plus the built-in sample session, which never counts against it. Everything before the export is free and uncapped: import as much as you like, of any length, hear the whole cleaned result, and see the measured figure on your own recording.

Re-exporting a session you have already exported is free. The count is spent on a session, not on a tap, and only when a share actually happens — opening the export sheet and changing your mind costs nothing.

I reinstalled the App and my free export is still used

That is deliberate. The count is kept in your device’s keychain, which outlives deleting the app; with it stored in ordinary preferences, deleting and reinstalling was an unlimited supply of free exports. The privacy policy describes exactly what that number is and what it is not.

It says there is not enough space

Cleaning writes new files rather than touching your originals, and a two-microphone session is two of them — a long recording needs room. The App checks before it starts rather than failing part-way through. Free up space and try again.

Did it change my originals?

No. The App always writes new files and never modifies what you imported. Keep your originals anyway — no app should be the only copy of anything you care about.

Subscription

I subscribed but the App still says free

Settings ▸ Restore Purchases. If it still does not appear, check that you are signed in with the same Apple Account you subscribed with.

How do I cancel?

iOS Settings ▸ your name ▸ Subscriptions ▸ Mic Bleed Remover ▸ Cancel Subscription. Cancelling takes effect at the end of the period you have already paid for. Deleting the App does not cancel a subscription.

Is there a trial?

The annual plan includes a 7-day free trial for new subscribers. Cancel before it ends and you are not charged. If you have used a trial for this subscription before, you are charged immediately.

Can I have a refund?

Refunds are handled by Apple, under Apple’s policies — we cannot issue them. Request one at reportaproblem.apple.com.

Privacy

Where do my recordings go?

Nowhere. They stay on your device, because the App contains no code capable of sending them anywhere — no account, no analytics, no server. You can confirm it yourself with Airplane Mode: everything still works. See the privacy policy.

What permissions does it ask for?

None at all. It does not record audio, so it never asks for your microphone, and picking a file or a video uses the system pickers, which need no permission and hand over only what you chose.

Something else

Email

support@bulpara.com

For a bug report, the three things that help most are how the two tracks were recorded (one dual-channel file or two separate ones, and on what), what the App said about the alignment, and the figure it measured. Your recordings never leave your device unless you choose to attach one, and you do not need to.