2022-03-05 17:31 - Edit on GitHub

When one or more samples are selected in the tree, the tool menu contains several tools sorted in 4 categories:

Using the tools simultaneously on several samples is possible (with a multi selection).


Show peak frequencies

This tool gathers the information on the peak frequencies of all selected samples, and the results can be exported in a .csv file. The peak frequencies are visible in the editing page of samples.

Show peak frequencies
Show peak frequencies


Wav export

After having selected a destination directory, all selected samples will be exported as .wav files.

Sample processing

Auto loop

The software seeks a stable area of the sample and then artificially creates a loop. A sound segment is copied with a cross-fade, so that the transition at the join location is as smooth as possible.

To assign loop points automatically:

  1. click in the tree on the sample to be looped,
  2. in the editing page of samples:
    • position the start and end of the loop in the graphic (WAV display area) around a stable area, or
    • let the tool determine automatically a stable area by defining 0 as loop start and loop end,
  3. in the Tools menu select Auto loop,
  4. press the Play button with the loop option checked,
  5. if the loop points found are not suitable you can undo the operation, try repositioning them manually around a stable area and then use the Auto loop function again.

The tool needs to find a stable area of more than 0.25 seconds. If it fails, a warning message appears indicating that no loop can be found.

Warning: This tool modifies the original sample. Modifications can be undone via the “undo” function, but if the file is saved and Polyphone is closed there is no way to step back.

Note: By default, the looping is disabled in an instrument. To hear it, you must select loop on in the Loop playback parameter row of either the Global or individual notes columns in the table. loop on turns it On, loop off turns it Off. loop on and end turns the looping On and the sample will play to the end after a key is released.

Change volume

You can change the sample volume in three different ways:

  • in adding a certain amount of dB (positive or negative amount),
  • in multiplying the signal by a number,
  • in normalizing the signal so that the maximum of this signal represents some percentage of the maximum intensity.
Change volume tool
Change volume tool

External command

This tool allows you to use an external command or program to edit a sample. You don't need to export and re-import a sample into Polyphone anymore, everything is done automatically:

  1. download an editing software for .wav files such as Audacity or Sweep (Linux),
  2. use the tool External command for one or more samples,
  3. fill the command line in the right field to call the external software (you may need to read the documentation of this software),
  4. edit the sample(s) with the external tool,
  5. save the modified version of the wav file(s) with the external tool and close it,
  6. the sample(s) will be automatically loaded into the soundfont.
External command tool
External command tool

Note: during the process, Polyphone exports a .wav file and will reimport this same file after the external command has been run. If the external command creates other files or saves the result as another file, those files will be ignored and Polyphone will reimport the file initially exported that will probably be not modified.

Filter frequencies

When you use this tool, a window will be displayed showing the frequencies contained in the sample(s) you selected. You can then use the mouse to draw a red area. Everything that is in this area will be removed: this means that you can manually decrease of remove some frequencies.

Filter frequency tool
Filter frequency tool

Note: This filter is not common since it cuts frequencies in a hard way. This tool can be useful to design a brick-wall filter but in most cases you will probably want to use the equalizer.

Remove blank at start

Any blank area before the sample begins is eliminated. This reduces the time before the sound is heard.

Remove blank at start
Remove blank at start

Note: this tool may be applied automatically each time a sample is imported, the option being in the software settings.


The tool asks for a shift in semitones and then re-samples the sound to change the pitch.

Transpose tool
Transpose tool

Trim to end of loop

If a loop is defined for the selected sample, the software will cut the sound after the end of the loop (leaving a small margin at the end).

Trim to loop
Trim to loop

Note: this tool may be applied automatically each time a sample is imported, according to the software settings.

Stereo samples

Balance adjustment

If the sample is linked to another one (stereo), the software can equalize the mean intensity of the two samples to adjust the balance. This will then be easier to accurately pan a sample in an instrument.

Among the selected samples, samples whose names only differ by the last letter (L / R) are automatically linked. For example, if in a soundfont two samples are called bassoon45L and bassoon45R, bassoon45L will be recognized as the left part of bassoon45R and bassoon45R will be recognized as the right part of bassoon45L.

With this information the right panning will be used when these samples are added in an instrument. You can also enjoy the simultaneous editing of left and right parts in the instrument table if the stereo editing is activated in the settings.

Warning: This tool can break existing links if the names don't match the rule above.

All selected samples that are linked (stereo) are unlinked.

Thus, all samples will be processed as mono sounds and they will all have the same panning if they are added in an instrument. The stereo editing, if activated in the settings, will not be applicable anymore.

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