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IDProjectCategoryView StatusLast Update
0001363OpenMPTGeneralpublic2020-10-10 13:02
Reporterakkadian5 Assigned To 
Status newResolutionopen 
Platformx64OSWindowsOS Version10
Product VersionOpenMPT / libopenmpt 0.5.2 (upgrade first) 
Summary0001363: FM vibrato and tremolo depth settings

The manual describes the FM display tremolo and vibrato as 4.8 dB / 14 cents, respectively.
However, registers are not set correctly and the actual setting seems to be 1db / 7 cents.
In particular, the 4.8dB tremolo is convenient for patch creation, so I think it needs to be initialized correctly.
(Although it is possible to add a switching option in the future, I think that priority is low)

TagsNo tags attached.
Has the bug occurred in previous versions?
Tested code revision (in case you know it)


related to 0001187 new OPL3 improvements for MPTM 


Saga Musix

Saga Musix

2020-09-21 21:39

administrator   ~0004443

Those tremolo/vibrato settings are not exposed by either the SBI format or S3M AdLib patches, as far as I'm aware. I wasn't even aware that they exist and that the default tremolo/vibrato depth are different from the values specific in the tooltips / manual. I will double-check and adjust the documentation if necessary, but it's unlikely that these values would become adjustable because ScreamTracker doesn't support them.

Saga Musix

Saga Musix

2020-10-10 12:59

administrator   ~0004470

Manual has been corrected. But as mentioned, for the time being it's unlikely that this will become configurable as neither the S3M nor SBI patch format actually dump the register (0xBD) that contains this information.

Saga Musix

Saga Musix

2020-10-10 13:01

administrator   ~0004471

It's also worth nothing that this is a global register, i.e. it applies to all active voices (you cannot have one patch use tremolo at 1dB and another patch at 4.8dB). Given that I want to move MPTM into the direction of using one emulator instance per instrument, this wouldn't be an issue if we decide to implement this flag in MPTM format, though.

Issue History

Date Modified Username Field Change
2020-09-21 04:09 akkadian5 New Issue
2020-09-21 21:39 Saga Musix Note Added: 0004443
2020-10-10 12:59 Saga Musix Note Added: 0004470
2020-10-10 13:01 Saga Musix Note Added: 0004471
2020-10-10 13:02 Saga Musix Relationship added related to 0001187