# Oscillators

Oscillators are continuously varying patterns. Unless otherwise stated, oscillators give minimum values of `0`

and maximum values of `1`

, and repeat once per cycle.

## #

What is an oscillator?Oscillators are continuous patterns, which means they don't have any structure, and must be used with a pattern that does. For example `d1 $ sound "bd*8" >| pan sine`

won't work well, because the `>|`

operator instructs **Tidal** to take structure from the right, and `sine`

doesn't have any structure, so **Tidal** will simply trigger events at a fixed rate (depending on your configuration, this might be very fast). `d1 $ sound "bd*8" |> pan sine`

is better, because `|>`

takes structure from the left, so eight kick drums will play, with pan values sampled from the sine wave for each of the eight events. Where a pattern has the type `Fractional a => Pattern a`

, that means that they can be used both as floating point numbers or (rational) time values.

## #

Using oscillators### #

Periodic oscillators#### #

Sine`sine`

is a sinusoïdal wave. Playing this example, you should hear the sound slowly moving from your left to your right speaker:

#### #

CosineA `cosine`

wave, is a `sine`

shifted in time by a quarter of a cycle. It sounds similar to the `sine`

above:

#### #

SquareA Square wave, starting at 0, then going up to 1 halfway through a cycle.

#### #

TriA triangle wave, starting at 0, then linearly rising to 1 halfway through a cycle, then down again:

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SawA sawtooth wave starting at 0, then linearly rising to 1 over one cycle, then jumping back to 0:

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IsawAn inverted sawtooth, starting at 1, then linearly falling to 0 over one cycle, then jumping back to 1:

### #

Non-periodic oscillators#### #

RandAn infinitely detailed stream of (pseudo-)random numbers. See the `rand`

reference page for more details.

#### #

IrandA function from an integer (giving the maximum) to a stream of (pseudo-)random integer numbers. For more details, head to the `rand`

reference page:

## #

Scaling oscillatorsBy default, the oscillators will output values scaled between `0`

and `1`

. You might want to use bigger or smaller values. You might want, for instance, to modulate the frequency of a filter or select a random midi note between `0`

and `127`

. To do so, you can use the `range`

function:

## #

Speeding up/down oscillatorsOscillators are patterns! It means that you can speed them up or down using the same function as usual (`fast`

, `slow`

, etc..):

##### tip

Notice that most of the time, the speed up/down will be in sync with your pattern. How convenient!