synthio.Envelope properties cannot be modified after creation
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 35/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 冷清
- 领域
- embedded-iot
调研方向
The issue does not name implementation files or tests. Start by locating the synthio.Envelope implementation and related tests, then determine how its properties are exposed and whether notes use the envelope while it changes. Done means the intended mutability and behavior during each envelope phase are decided, implemented, and documented.
由索引模型根据 Issue 内容生成。
描述
CircuitPython version and board name
Adafruit CircuitPython 10.1.4 on 2026-03-09; Raspberry Pi Pico W with rp2040
Code/REPL
Adafruit CircuitPython 10.1.4 on 2026-03-09; Raspberry Pi Pico W with rp2040
>>>
>>>
>>> import synthio
>>> test_env1 = synthio.Envelope(release_time=1.0)
>>> test_env1.release_time
1.0
>>> test_env1.release_time = 2.0
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
>>> test_env2 = synthio.Envelope(release_time=synthio.Math(synthio.MathOperation.ABS, 1.0))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: release_time must be of type float, not Math
Behavior
The properties are read only and cannot be changed. Using synthio.Math as a variable can't be used as a workaround.
Description
The envelope cannot be modified after it's been created. I mentioned this a while ago in a forum post but never tested it til now. This would include the case when the envelope is being actively used as an amplitude envelope for a synthio.Note. One case where this would be useful is changing the release time (based on a MIDI CC 72 message) while a note is being played and typically before the key is released.
If the properties are mutable then a decision would be needed on whether they affect a note in that phase, e.g. attack_level is changed during the attack phase. If the behaviour is documented I'm fine either way.
Additional information
@todbot and @relic-se may be interested in this or know of a workaround.
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