LinPlug Octopus User Manual

Page 18

Waveform Import / Export and Editing

Oscillator Waveforms can be created in two different ways: they can be

created in the waveform editors (amplitude and phase) or they can be

generated automatically from imported audio samples.

To create a user-defined waveform, first select an Oscillator. Each

Oscillator's waveform can consist of 32 harmonics. The amplitude of each

harmonic can be individually edited in the Harmonic Amplitude Editor by

clicking and dragging within the editor. The phase of each harmonic can

also be set in a similar manner in the Phase Editor. The waveform created

in the two harmonic editors is shown in the waveform display to the right of

the two editors.

Alternatively, a wav/aiff/octwav file can be loaded and used as the basis for

an oscillator waveform. When a wav/aiff file is loaded, it is first analysed

and then converted into 32 harmonics. The entire sample is regarded as a

single waveform, so if your sample has a duration of 5 seconds, it will have

a frequency of 0.2 Hz. Wav/Aiff samples are loaded into RAM in their

entirety. In order to save RAM, it's best to use short samples. However,

after samples are analysed, the RAM that they used is freed so it is possible

to analyse large samples. Stereo samples are converted to mono before

being analysed. The Octopus also supports the “octwav” format which is an

internal Octopus format consisting of only the harmonic information.

The Oscillator popup menu is used for general I/O and editing functions

within the module, particularly for interchanging spectrums between

Oscillators. The menu is accessed by clicking on the V beside the

Oscillators label. The popup menu contains five items: Copy Spectrum,

Paste Spectrum, Reset Spectrum, Import Spectrum, Export Spectrum.

Waveforms in any of the formats mentioned above (wav/aiff/octwav) can be

imported into the Octopus using the Import Spectrum menu item.

Regardless of the manner in which they were created, Waveforms can be

saved using the Export Spectrum menu item. Waveforms are saved in

Octopus' “octwav” format.

If at any stage, you want to start with a clean slate, the Reset Spectrum

item resets the spectrum to a single harmonic (sine wave).

When multiple Oscillators are being used, it's possible of transfer one

Oscillator's spectrum to another Oscillator using the Copy Spectrum and

Paste Spectrum menu items. Copy Spectrum copies the current Oscillator's

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