The apply attribute provides support for Max-style buffer functions and must be declared directly in the object box. These functions operate on the existing contents of a buffer and are destructive operations, meaning they alter the internal contents of the buffer on which they operate. Apply operations are cumulative and any number of them can operate on a given buffer.

The available functions are gain, for scaling the gain of the entire buffer by a certain amount, normalize, for scaling the buffer relative to a peak value (defined using the right inlet), and the windowing functions blackman , hamming , hanning , triangle , and welch . All windowing functions support the optional half argument, which must be declared as argument after the name of the function. When used, half applies the function only to the second half of the buffer.

Sets the buffer that the object will operate on when triggered.

The expression that will be used to fill the associated buffer. Supports the full rnbo expression language and library of operators. Some extra variables are provided to allow better access to the buffer:

1. x = 0 <= x <= 1,
2. value = the current value at the position,
3. index = current sample index,
4. bufsize = buffer size. You can also access the buffer directly via buffer[i].