Tools for samples

When one or more samples are selected in the tree, the "Tools" menu offers several features:

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

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

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:

  • click in the tree on the sample to be looped,
  • 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,
  • in the "Tools" menu select "Sample", "Auto loop",
  • press the Play button with the loop option checked,
  • 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. In this case it is possible to specify manually a stable area of more than 0.25 seconds and retry the tool, or try to find the loop points manually.

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 enter a "1" in the Loop playback parameter row of either the Global or individual notes columns in the Parameters Table. "1" turns it On, "0" turns it Off. The value "3" turns the looping On and the sample will play to the end after a key is released.

External command

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

  • download an editing software for wav files such as audacity or sweep (linux),
  • use the tool "External command" for one or more samples,
  • fill the command line in the right field to call the external software (you may need to read the documentation of this software),
  • edit the sample(s) with the external tool,
  • save the modified version of the wav file(s) with the external tool and close it,
  • the sample(s) will be automatically loaded into the soundfont.

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

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

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.

Change volume

You can change the 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.

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.


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