Audio files

How do I convert polyphonic BWF to mono BWF?

You can convert a polyphonic BWF file to mono files with a utility named BWF Splitter availble at http://www.one-n.com/.

What is this RIFF64 thing?

RIFF64 is a new format WAV file that can handle file sizes larger than 4 GB, You can find more information about the format here. Boom Recorder will create RIFF64 files automatically if you direct it to create a audio file larger than 4 GB.

What happended to the QuickTime file format

Because of the changes in version 7 of Boom Recorder, I have removed QuickTime output. You can still get audio + timecode into Final Cut Pro by using the "Broadcast WAVE Format" file format and the BWFImporter.component. After you place the BWFImporter.component in the /Library/QuickTime folder, Final Cut Pro will be able to read Boom Recorder's BWF files with timecode.

The BWFImporter.component uses the embedded 'qttc'-chunk in BWF files, you can find more information about this chunk in the manual.

Apple has just released an update for Final Cut Pro 5.1.2, this version should be able to read the timecode from the 'bext'-chunk natively. Users who have Final Cut Pro 5.1.2 or later may want to remove the "BWF Importer.component" from the /Library/QuickTime folder.


What hard disk do I need for recording a lot of channels or high sample rates?

After some test with a customer we found that a Firewire drive is preferable to an internal SATA disk. A possible reason for this is that a firewire controler is more intelligent than most SATA controllers and able to offload a lot of tasks from the CPU.

Is there a limit in how long you can record in a single take?

As you may be aware a BWF file has a limit of either 2 GB or 4 GB depending on the edit software. Because of this Boom Recorder will create new BWF files when reaching the 2 GB boundary for limitless recording. To do this, Boom Recorder uses the pre record buffer feature to make the continued files seamless.

You may change the 2 GB boundary to an other value, to for example make files exactly the size of a CD-ROM. You may also remove the boundary completely in which case Boom Recorder will automatically create RIFF64 files when the file grows beyond 4GB.


How can I use all audio channels on the interface and still have timecode?

At the start of the session you can jam Boom Recorder to a timecode signal using any audio channel on the interface. After the jam you can reuse the audio channel for audio.

How does Boom Recorder keep accurate time?

Boom Recorder counts the samples that comes from the audio interface, thus the accuracy of Boom Recorder's time keeping is depended on the accuracy of the sample rate of the audio interface.

You can increase the sample rate accuracy by clocking the audio interface externally using the word clock input.

Weird behavour

Not all sample rates are shown in Boom Recorder

Audio interfaces advertises sample rates to an audio application using a list of sample rate ranges. The Griffin iMic for example advertises a single sample rate range of 6400Hz-48000Hz or something like this. This is perfectly valid for an audio interface to do. However most audio interfaces advertises its sample rate ranges as: 44100Hz-44100Hz, 48000Hz-48000Hz, 88200Hz-88200Hz, 96000Hz-96000Hz. Which basically means the audio interface is advertising discrete sample rates.

Boom Recorder only works with discrete sample rates, it looks for the lowest sample rate in each range the interface advertises and populates the pull-down menu with them. I regard this as a low priority bug of Boom Recorder, although it is hard to solve, because the user should be able to select any sample rate in each range. I have no idea yet on how to design a nice user interface for this.

Now, as long as you don't select a sample rate from the pull-down menu, Boom Recorder will not change the sample rate of the audio interface, not even when you start Boom Recorder. You can use an other application to set the sample rate of such an interface, although Boom Recorder will not show the correct sample rate in the "sample rate" pull-down menu, it is set correctly and Boom Recorder should create correct audio files. You can see the correct sample rate in the Metadata preferences panel in the "Stamp sample rate as" pull-down menu (in Boom Recorder 7 and later).

Playback doesn't work for build-in audio on Intel Mac's.

The new Intel Mac's have a separate devices for the inputs and outputs. For playback you will need to change the selected device. Or create an aggregate from both input and output using the "Audio MIDI Setup".

Why aren't the same channels recorded which I've armed?

The behavour of Mac OS X has changed with regards to preferences and binding, please update to Mac OS X 10.4.4 or later. If you do not have the option to update Mac OS X you will have to quit and launch Boom Recorder after you have (dis)armed the channels.

Why won't the ADAT channels on my digidesign interface work?

This problem may be solved by updating to Mac OS X 10.4.4 or later and ProTools LE 6.9 or later.

I receive distortion on my intel Mac with a digidesign interface

This problem may be solved by updating to Pro Tools LE 7.1.1cs1 or later.

I experience clicking with a digidesign interface

This may be due to an incorrect selected clock source, sometimes Boom Recorder is not able to set the correct clock source. You can solve this by using Pro Tools to set the clock source; the clock source can then show up blank in Boom Recorder, you can keep this blank.

Why doesn't Pro Tools open my polyphonic BWF file?

Some versions of Pro Tools can only handle polyphonic files up to 8 channels. From what I understand Pro Tools regards polyphonic files as surround sound files up to 7.1 channels.

I can not group my mono files as a clip in Avid.

Avid does not handle multiple mono files. Avid does handle polyphonic files as long as there are an even number of channels recorded into it.


What do the version numbers mean?

The version number consists of three numbers separated by dots, for example: 5.7.3. The first number is the major number, this is incremented when something major has changed in the architecture of Boom Recorder.The second number is the minor number, this is incremented when a feature has been added to Boom Recorder, these features did not change anything significant. The third number is incremented when a bug is fixed, and no major change was needed.

Why are there so many releases?

When I hear of a bug, or a simple feature request from a user, I make a change and pretty much release it immediately.

How do I find out about new versions?

Newest versions you can always find in the downloads section on this website.