The document says:

> To access the data stored inside the buffer, use the data() or constData() methods.

 But the data() and constData() methods are missing from PySide6 (Not Qt6):

dir(buffer):
00:'__class__'
01:'__copy__'
02:'__delattr__'
03:'__dict__'
04:'__dir__'
05:'__doc__'
06:'__eq__'
07:'__format__'
08:'__ge__'
09:'__getattribute__'
10:'__gt__'
11:'__hash__'
12:'__init__'
13:'__init_subclass__'
14:'__le__'
15:'__lt__'
16:'__module__'
17:'__ne__'
18:'__new__'
19:'__reduce__'
20:'__reduce_ex__'
21:'__repr__'
22:'__setattr__'
23:'__sizeof__'
24:'__str__'
25:'__subclasshook__'
26:'byteCount'
27:'duration'
28:'format'
29:'frameCount'
30:'isValid'
31:'sampleCount'
32:'startTime'

template <typename T> const T *QAudioBuffer::data() const
template <typename T> T *QAudioBuffer::data()

Returns a pointer to this buffer's data. You can modify the data through the returned pointer.
Since QAudioBuffer objects are explicitly shared, you should usually call detach() before modifying the data through this function.
There is also a templatized version of data() allows you to retrieve a specific type of pointer to the data. Note that there is no checking done on the format of the audio buffer - this is simply a convenience function.