How to convert single cycle waveforms to AMS files

AMS files are multi-cycle waveforms that can be generated from Ableton Operator's additive synthesis editor. It can also be used with Ableton Sampler and Simpler.

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BaseFreq/BaseNote

BaseFreq stands for fundamental frequency. 261.625549 on the text means 261.625549 Hz, and it is worth C3 of 12 temperament. The fundamental frequency can be changed freely.

Also, BaseFreq can be rewritten to BaseNote. BaseNote allows you to enter midi note numbers instead of frequencies.

BaseFreq 261.625549 = BaseNote 60

RootKey

RootKey can be applied when importing into Sampler. 60 on the text means Midi note number 60, which means the root of the current sample. Sampler is set to C3 and is set to play only C3 on the keyboard.

SampleRate

SampleRate means sampling frequency, default 44100 means 44.1 khz. Basically, it is common to enter 96000, 48000, 44100.

BitsPerSample
You can set the bit of sample. It can be changed to 16, 24, and 32 bit.

Volume

Volume means the volume of the waveform. By default, it is Auto, but you can enter it and set it. However, it is recommended to leave it as Auto because it will overrun depending on the number.

Sine 1~64
Sine1 ~ 64 can set the volume of 1 ~ 64 harmonics. The default is 64 but it can be extended to 128. You can also set cosine waves. This allows you to convert existing Single cycle waveforms into AMS files.

Convert SCWs to AMS files

AMS files can be text-edited, so we use Octave, a numerical analysis programming software, to perform Fourier series transformation on single cycle waveforms. Export the result as a csv file and convert it to an AMS file by outputting the extension as .ams.

Download the following

• GNU Octave (Numerical analysis software)
• AMS Converter.txt
  
• ATOM(text editor)
• Single cycle waveforms(Only wav files / There is no specification for the lengths of SCWs.)

Workflow

1. Run Octave to convert single cycle waveform to AMS file
2. Start Atom and edit AMS file (delete end of line space)
   
3. Completed

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1. Octave

1. Start Octave, copy the contents of AMS Converter.txt and paste it into Octave editor
   
2. Create a folder and save Octave script there
3. Similarly, put single cycle waveforms in the folder.
4. Execute script
5. Two types of waveforms are output. One is the original waveform. The other is a waveform composed of a phase 0 sine wave for Ableton Operator.

2.Text editing

1. Add folder to ATOM
2. Right click on the folder and select “Serch in Folder”
3. Select. * [Use Reges], enter " +$" in [Find in project], and select [Find all]
   
4. Select [Replace All] without entering anything

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You can convert multiple Single cycle waveforms in a folder at once.

More information about AMS files (Japanese)
1,2,3,4