<![CDATA[skelux.root.sx - Super Mario 64]]>

<![CDATA[Sound Sample Tuning (N64 Sound Tool)]]> https://skelux.root.sx/showthread.php?tid=888 Wed, 17 Jan 2018 03:36:28 +1100 https://skelux.root.sx/showthread.php?tid=888 Some of these parameters are labelled "ADSR" under the sound tool.
More information on ADSR parameters are discussed in this thread.
Furthermore, there are parameters for base keys and instrument looping. Here, I'll discuss everything I know about the subject.
In most games, base key is given by a byte (0-127 or 0x00-0x7F) with a de-tune byte alongside.
In SM64, the base key is given by a float, in which one can assign a fractional key without using de-tune.
The following formula converts key to float:

Code:

​Float = 2^((60-key)/12)

Here is a graph of the function:
[Image: SM64KeyToFloat.png]

And here is an entire table of floats for each key:

So, if you wanted a 72-and-a-half key (mid-semitone), you would use 2^((60-72.5)/12) = 0.485766.

Now, there are optional previous and secondary samples for instruments. Using the "splits/release" value in the sound tool, you can choose the ranges for the primary sample before it splits to the previous or secondary sample (min/max keys before switch).

The value goes something like:

Code:

​[00] [Min Key +- 0x15] [Max Key +- 0x15] [Release Time]

Where each value is a byte. I'm not sure why 0x15 is added or subtracted from each, but it's consistent, as in for 3 samples, it'll always be subtracted, and for previous-primary, it's always added. (More testing needed)

For instrument looping, having count set to 0x00000000 will DISABLE looping.
Having count set to 0xFFFFFFFF will ENABLE looping.
As for start and end, I haven't experimented enough with it, but the values seem time based.
So having a larger value for end will wait longer for the loop.
Let me know if you discover any more information on sound data!
(Credit to shygoo for figuring out the float from key formula given correlated data)]]> Some of these parameters are labelled "ADSR" under the sound tool.
More information on ADSR parameters are discussed in this thread.
Furthermore, there are parameters for base keys and instrument looping. Here, I'll discuss everything I know about the subject.
In most games, base key is given by a byte (0-127 or 0x00-0x7F) with a de-tune byte alongside.
In SM64, the base key is given by a float, in which one can assign a fractional key without using de-tune.
The following formula converts key to float:

Code:

​Float = 2^((60-key)/12)

Here is a graph of the function:
[Image: SM64KeyToFloat.png]

And here is an entire table of floats for each key:

Code:

​[00] [Min Key +- 0x15] [Max Key +- 0x15] [Release Time]