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Add a command to set the TP offset.

Currently, the parameters of the software envelope are specified only in milliseconds. While this makes it easy to understand intervals, a problem arises when the tempo is changed. The shape of the envelope does not scale with changes in the length of each note.

To address this issue, we propose adding a time_unit variable to the SW_ENV_INFO structure, allowing the time units for the software envelope parameters ($A, $H, $D, $F, $R) to be switched. A new command $U will be added to modify the time_unit value.

• Default: time_unit = 0 (milliseconds, as before)
• NoteLength units: time_unit = 1 - 1024

For example, if time_unit = 128, the time unit for the parameters will correspond to the length of a 128th note. This enhancement will enable the envelope to adapt more flexibly to tempo changes.

Add a default constructor to classes Psgino and PsginoZ. Additionally, implement an Initialize method to allow shifting of initialization timing.

Add a header section to specify MML version information and system settings.

In this issue, we will consider implementing a method to break loops with a large or infinite number of repetitions in MML

Issue Summary:
The newly implemented speed_unit parameter for the software LFO does not function correctly when set to a value other than 0. Specifically, the bug lies in the local function get_lfo_freq(), where the calculation for speed_unit values other than 0 is incorrect. This results in improper LFO behavior.

Additional Changes:

• The $L command's value range has been expanded from 0-200 to -200 to 200. This adjustment ensures that when $L is set to a negative value, the LFO's modulation waveform begins with a phase of 0°, rather than being 180° out of phase.
• Ideally, the $L command value should produce a phase of 0° when the value is 0 or greater, and 180° when less than 0. However, to maintain compatibility, the current approach will be used.

Currently, the LFO frequency specified by the $L command is set in 0.1 Hz units. We propose adding the option to set the LFO frequency using the reciprocal of note lengths. When speed_unit is 0, the $L command uses 0.1 Hz as before. If speed_unit is non-zero, the unit will be the reciprocal of (note_len*10).

We will introduce the $V command to set speed_unit. For example:

• $V4 and $L10 will result in 1.0 frequency modulations per quarter note.
• $V8 and $L25 will result in 2.5 frequency modulations per eighth note.

This allows the number of modulations per note to remain consistent, even if the tempo changes.

There is a bug where the LFO does not function correctly when low frequencies are specified.

Add an MML command to execute a user-defined callback function.

Enable non-decimal notation for the "@C" command argument. When using the "@C" parameter with a (numeric string), it should convert the value based on the prefix (0, 0x). If parentheses are omitted, it will default to decimal notation as before.

Parentheses are used to clarify whether A-F should be interpreted as hexadecimal digits or notes.