Open an existing or record a new file.

If too much noise is in the record, you can reduce it.
Tap on Effects and in the menu on “Noise reduction”.

Now you see the dialog for noise reduction.
Tap on Play  to hear the sound with the activated filter. Deactivate the Preview checkbox while the playing to compare the originalsound with the filtered.
To suppress more of the noise sound, you can increase the Threshold.
With the “Cut off frequency” you can suppress the typical hight frequency noise.

Tap on Apply. Now you see in the silent areas the effect of the noise reduction.

Open an existing or record a new file.

Tap on Import / Mix and in the menu on “Mixes the current file with another file”.

Choose a file and tap on Open.

In the dialog “Mix files” you can set the audio level of the current file and the imported file.
If the checkbox “Increase the selection if imported mix file is longer” is checked, the result duration will increase at the end, if the imported file is longer than the end if the current file.

Set the desired start position with the start selector . It is the startpoint to mix in the second file.

Click on Play for preview to verify the startposition and the mix volumes of the two files.

Tap on “Apply” to mix the two files. You can see the mixed result between the start and end selector.

Open an existing or record a new file.

Select a start position  or a range with a start and end position. At this position or range the new record will insert.

Tap on Rec into selection and record your audio sound.

The recorded audio sound will insert in your defined range and the old sound will overwritten.

Open an existing or record a new file.

Tap on Import / Mix and in the menu on “Import from file”.

Choose the sound file you want to append at the end of the actual file. If no start selector is defined, the sound file will append at the end.

Tap on “Open” and the file will import.

If you want to append the sound file not at the end of the record, you can define a start selector. Move the start selector to the desired position and tap under Import / Mix on “Import from file”. The sound file will insert at the selector position.

Also you can replace a range between the start and end selector.

First define the start position. Move the start selector to the desired position. If you want to set the start position exact to the sound file start, tap two seconds on the start selector and tap in the context menu on “Set to startposition”.

Move the end selector to the desired end position.

To adjust the end of the selection more accurate, double tap before the end of the selection in the orange area to play the last part. Now you can Zoom in and move the end selector more precise.

Tap on Trim to remove the area outside the selection.