- Update to version 0.4.0:
  * [New] libopenmpt now includes emulation of the OPL chip and
    thus plays OPL instruments in S3M, C67 and MPTM files.
    OPL chip emulation volume can be changed with the new ctl
    render.opl.volume_factor.
  * [New] libopenmpt now supports CDFM / Composer 670 module files.
  * [New] libopenmpt: New ctl play.at_end can be used to change
    what happens when the song end is reached:
    - “fadeout”: Fades the module out for a short while.
      Subsequent reads after the fadeout will return 0 rendered
      frames. This is the default and identical to the behaviour
      in previous libopenmpt versions.
    - “continue”: Returns 0 rendered frames when the song end is
      reached. Subsequent reads will continue playing from the song
      start or loop start. This can be used for custom loop logic,
      such as loop auto-detection and longer fadeouts.
    - “stop”: Returns 0 rendered frames when the song end is
      reached. Subsequent reads will return 0 rendered frames.
  * [New] Add new metadata fields "originaltype" and
    "originaltype_long" which allow more clearly reflecting what
    is going on with converted formats like MO3 and GDM.
  * [Change] openmpt123: openmpt123 now rejects --output-type in
    --ui and --batch modes and also rejects --output in --render
    mode. These combinations of options really made no sense and
    were rather confusing.
  * [Regression] Support for libmpg123 older than 1.14.0 has been
    removed.
  * [Regression] libmodplug: Support for emulating libmodplug
    0.8.7 API/ABI has been removed.
  * [Bug] xmp-openmpt: Sample rate and number of output channels
    were not applied correctly when using per-file settings.
  * [Bug] Internal mixer state was not initialized properly when
    initially rendering in 44100kHz stereo format.
  * [Bug] openmpt123: Prevent libsdl2 and libsdl from being enabled
    at the same time because they conflict with each other.
  * [Bug] libmodplug: Setting SNDMIX_NORESAMPLING in the C++ API
    always resulted in linear interpolation instead of nearest
    neighbour
  * IT: In Compatible Gxx mode, allow sample changes next to a tone
    portamento effect if a previous sample has already stopped
    playing.
  * IT: Fix broken volume envelopes with negative values as found
    in breakdwn.it by Elysis.
  * MOD: Slides and delayed notes are executed on every repetition
    of a row with row delay (fixes “ode to protracker”).
  * XM: If the sustain point of the panning envelope is reached
    before key-off, it is never released.
  * XM: Do not default recall volume / panning for delayed
    instrument-less notes
  * XM :E60 loop bug was not considered in song length calucation.
  * S3M: Notes without instrument number use previous note’s sample
    offset.
  * Tighten M15 and MOD file rejection heuristics.
  * J2B: Ignore frequency limits from file header.
    Fixes Medivo.j2b, broken since libopenmpt-0.2.6401-beta17.
  * STM: More accurate tempo calculation.
  * STM: Better support for early format revisions (no such files
    have been found in the wild, though).
  * STM: Last character of sample name was missing.
  * SFX: Work around bad conversions of the “Operation Stealth”
    soundtrack by turning pattern breaks into note stops.
  * IMF: Filter cutoff was upside down and the cutoff range was
    too small.
  * ParamEq plugin center frequency was not limited correctly.
  * Keep track of active SFx macro during seeking.
  * The “note cut” duplicate note action did not volume-ramp the
    previously playing sample.
  * A song starting with non-existing patterns could not be played.
  * DSM: Support restart position and 16-bit samples.
  * DTM: Import global volume.
  * MOD: Support notes in octave 2, like in FastTracker 2
    (fixes DOPE.MOD).
  * Do not apply Amiga playback heuristics to MOD files that have
    clearly been written with a PC tracker.
  * MPTM: More logical release node behaviour.
  * Subsong search is now less thorough. It could previously find
    many subsongs that are technically correct (unplayed rows at
    the beginning of patterns that have been jumped over due to
    pattern breaks), but so far no real-world module that would
    require such a thorough subsong detection was found. The old
    mechanism caused way more false positives than intended with
    real-world modules, though.
  * Restrict the unpacked size of compressed DMF, IT, MDL and MO3
    samples to avoid huge allocations with malformed small files.

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