This filter is an extremely simple lo/hi/band/notch filter.
You can change its mode with the pulldown menu. The modes are:
... cut out a particular frequency.
cut out everything but a particular frequency.
cut out above a particular frequency.
cut out below a particular frequency.
...
...
The frequency is in hertz, and its meaning depends on the selected mode.
The bandwidth is supposed to be the cutoff rate (meaning how sharply the filter's output over frequency drop to 0). It doesn't work very well in some modes.
The fader allows you to adjust an envelope which is applied over a certain number of beats. Enveloping means to change the volume gradually over time.
The bounce filter temporarily replaces the sound stream with sound from a fraction of a beat earlier in the song. By applying this filter in time with the music, it is possible to double or drop beats.
The bounce filter has one parameter, the amount of delay. This is displayed as a number of eighth beats; a value of four corresponds to half of a beat.
The spin filter temporarily causes a section of music to be looped. While this loop is being played back, the underlying song continues to play at a normal speed, so that it will stay synchronized.
The primary parameter is the amount of boffer. This is displayed as a number of whole beats. If the bpm of the song is not known, a tempo of 60 bpm is assumed. If a negative number is specified as the beat factor, then the delay will be the negative inverse of that number; for instance, a value of -2 corresponds to a half beat period.
The spin filter can be locked into a spin mode. In this situation, depressing the temporary spin button will cause the looped buffer to be overwritten by incoming sound. The spun sound will die if the underlying song stops.
The fir filter allows users to graphically place echoes of different delays and volumes. At small delays, this will affect the tone of the sound. The fir filter can also be used to place echoes with delays equal to a fraction of a beat.
The largest component in the fir filter is the display area. Grid units are marked off on the display area for guidance. The horizontal axis represents time, and vertical bars are drawn every n samples. The vertical axis represents volume. Clicking with the left button will add an echo. An echo can be dragged with the left button, and removed with the right. To the right of the display area is a scrollbar which controls the zoom level in the time domain.
The grid unit adjustment controls the time represented by each vertical bar. This number is in samples, where 44100 samples equal one second. The time between bars can also be set as a number of beats. When the beats scrollbar is set to non-zero value, the grid unit value is remembered, and this value is restored when the beat_factor is set to zero.
The normalize toggle button causes the total volume of all echoes to be held constant. The maximum value is given by the scale adjustment. If the volume is not normalized, then the scale value is applied to each echo's volume.
The flange filter applies a reverb with a varying delay, resulting in "swooshing" sounds.
The flange filter has a display area similar the the fir filter's, into which echoes can be placed and relocated. However, note that multiple echoes will greatly increase the instability of the filter.
The echoes are varied according to a sine wave, triangle wave, or buffer. The frequency of the this waveform can be adjusted with the hz slider. The lowest, center, and greatest values can be set with the three horizontal sliders.
The overall amount of effect applied is controlled with the effect slider.
The mininetwork filter allows users to build simple filter networks by graphically arranging filter icons.
When the mininetwork filter is launched, two icons are present. The green icon at the top represents the input, and the red icon the output. These two are connected such that sound flows straight through the filter.
Select a filter type, e.g. delay, from the list. Clicking on the display area will add a delay filter. The icon can be dragged by its center to move it. Drawing a line from the bottom of the green input icon to the top of the delay filter will connect the two. There is no restriction to how many connections can be made from the output of any filter, so the input will retain its connection to the output. Once the output of the delay filter is connected to the large read icon, sound will also flow through the delay filter.
Clicking on any icon will bring up a panel displaying the parameters of the filter. For instance, clicking on the delay filter allows control over the amount of delay. For convenience, the scale of the delay can also be changed.
Filters can be inserted between existing filters. After selecting the desired filter type (say, gain) click with the middle button on a connection between two filters. A gain filter is inserted and connected such that it controls the volume of the sound flowing through that connection.
A filter and all its connections can be removed by clicking on the filter with the right button.
The middle button will remove the filter, but restore as many connections as possible. A connection can be removed by right clicking on it.