Category Archives: Soundengineering

An easy and free way to add a master EQ/FX/… to your OSX System – and include correction curves for your Headphones

An easy and free way to add a master EQ/FX/… to your OSX System.  This can also be used to include correction curves for your Headphones.

Lets say we want to correct the curve of a pair of Sennheiser HD-25 Plus Headphones.

Therefore we use the AutoEQ web application. This shows the correction curve for the headphones as well as values for a variety of different equalizer applications. For Apple/OSX systems it is convenient to use the AUNBandEq as it already comes with the system.

The AUNBandEq can easily be included into the main/master signal chain by using Apple AU-Lab in combination with the Soundflower Application. (Links below) And thats it. Now you have a master EQ for your complete System.

AU Lab:


“MacOS system extension that allows applications to pass audio to other applications. Soundflower works on macOS Catalina.”

creating jukebox labels



Audio file conversion with afconvert (mac)

I was looking for a simple and elegant way to convert a high amount of audio files from one format (.caf) to another (.aif). The solution i found is a very elegant one and also comes included with your operating system – if using a MAC.

And now here is the most amazing part. It is super easy to execute the conversion of multiple files by just one command line.

or to run through subdirectories:

or with recursion by using find:

Key linear PCM format
LE Little Endian
BE Big Endian
F Floating point
I Integer
UI Unsigned integer
8/16/24/32/64 Number of bits

Number of bits Information Size
8 256
16 65536
24 16777216
32 4294967296
64 18446744073709551616

Audio file and data formats: data_formats:
‘3gpp’ = 3GP Audio (.3gp) ‘Qclp’ ‘aac ‘ ‘aace’ ‘aach’ ‘aacl’ ‘aacp’ ‘samr’
‘3gp2’ = 3GPP-2 Audio (.3g2) Qclp’ ‘aac ‘ ‘aace’ ‘aach’ ‘aacl’ ‘aacp’ ‘samr’
‘adts’ = AAC ADTS (.aac, .adts) ‘aac ‘ ‘aach’ ‘aacp’
‘ac-3’ = AC3 (.ac3) ‘ac-3’
‘AIFC’ = AIFC (.aifc, .aiff, .aif) I8 BEI16 BEI24 BEI32 BEF32 BEF64 UI8 ‘ulaw’ ‘alaw’ ‘MAC3’ ‘MAC6’ ‘ima4’ ‘QDMC’ ‘QDM2’ ‘Qclp’ ‘agsm’
‘AIFF’ = AIFF (.aiff, .aif) I8 BEI16 BEI24 BEI32
‘amrf’ = AMR (.amr) ‘samr’
‘m4af’ = Apple MPEG-4 Audio (.m4a, .m4r) ‘aac ‘ ‘aace’ ‘aach’ ‘aacl’ ‘aacp’ ‘alac’
‘caff’ = CAF (.caf) ‘.mp1’ ‘.mp2’ ‘.mp3’ ‘QDM2’ ‘QDMC’ ‘Qclp’ ‘Qclq’ ‘aac ‘ ‘aace’ ‘aach’ ‘aacl’ ‘aacp’ ‘alac’ ‘alaw’ ‘dvi8’ ‘ilbc’ ‘ima4’ I8 BEI16 BEI24 BEI32 BEF32 BEF64 LEI16 LEI24 LEI32 LEF32 LEF64 ‘ms\x00\x02’ ‘ms\x00\x11’ ‘ms\x001’ ‘paac’ ‘samr’ ‘ulaw’
‘MPG1’ = MPEG Layer 1 (.mp1, .mpeg, .mpa) ‘.mp1’
‘MPG2’ = MPEG Layer 2 (.mp2, .mpeg, .mpa) ‘.mp2’
‘MPG3’ = MPEG Layer 3 (.mp3, .mpeg, .mpa) ‘.mp3’
‘mp4f’ = MPEG-4 Audio (.mp4) data_formats: ‘aac ‘ ‘aace’ ‘aach’ ‘aacl’ ‘aacp’
‘NeXT’ = NeXT/Sun (.snd, .au) I8 BEI16 BEI24 BEI32 BEF32 BEF64 ‘ulaw’
‘Sd2f’ = Sound Designer II (.sd2) I8 BEI16 BEI24 BEI32
‘WAVE’ = WAVE (.wav) UI8 LEI16 LEI24 LEI32 LEF32 LEF64 ‘ulaw’ ‘alaw’

My Sounds (

This is a collection of my sounds at I try to keep the list up to date but sometimes there are more sounds available on freesound therefore please check out my freesound account and freesound in general. “Freesound is a collaborative database of Creative Commons Licensed sounds. Browse, download and share sounds.” –

Creating sounds out of financial data.