ScummVM also looks for CM32L_PCM.ROM and CM32L_CONTROL.ROM-the ROMs from the CM-32L device-and uses these instead of the MT32 ROMs if they are available. Place these ROMs in the game directory, in your extrapath, or in the directory where your ScummVM executable resides. ScummVM can emulate the MT-32 device, however you must provide the original MT-32 ROMs, taken from the MT-32 module, for the emulator to work. Some games which contain MIDI music data have tracks designed specifically for the Roland MT-32. MT-32 devices also use MIDI as the communications protocol. The MT-32 is a Roland sound module, although the term also commonly refers to a range of devices that are fully compatible with the MT-32. The processor requirements for FluidSynth are quite high a fast CPU is recommended. Use the MIDI gain setting to further adjust this. The default output volume from FluidSynth can be fairly low, so ScummVM automatically sets the gain to get a stronger signal. See the ScummVM forum for an example of a great SoundFont. MIDI is like digital sheet music it needs a library of sound samples known as a SoundFont to draw from to synthesize music. You will have to specify a SoundFont in the MIDI tab for ScummVM to use FluidSynth. If the ScummVM you’re using has libfluidsynth support it will be able to play MIDI music by using the FluidSynth emulator if set as the Preferred device or Music device, or if specified in the MIDI tab when Preferred device or Music device is set to and ScummVM chooses General MIDI output automatically. ![]() General MIDI device emulation (FluidSynth) ¶ While using MIDI as its protocol, it also specifies an instrument map and some other information that devices must implement. General MIDI is a MIDI standard which is implemented by a large number of devices. ScummVM can now convert MIDI data to sampled audio using MIDI device emulators. In the past this prevented audio for these games from working on platforms that did not support MIDI, or with soundcards that did not provide MIDI drivers. Generally, soundcard drivers work with software synthesizers to interpret MIDI and output audio. While some older soundcards (and a few modern ones) have their own hardware-based synthesizers, this is relatively rare. Hardware or software synthesizers create (synthesize) audio by interpreting the information given to them by the MIDI protocol. MIDI is a communications protocol for musical information it can be likened to digital sheet music. To find out which emulation is compatible with the game you’re playing, have a look at the manual that comes with the game. This is mostly supported by older games, and was the only option before sound cards became widely used. PC Speaker: emulates the built-in PC speaker. Many of these old-school audio devices can be emulated by ScummVM: ![]() The evolution of PC audio ¶įor a look at the evolution of PC audio, see this video on YouTube, or this excellent post. For example, changing the General MIDI settings will not have any effect on a game that only has CD audio. Not all settings are applicable to all games. If Preferred device or Music device is set to either an MT-32 device or a GM device, ScummVM will use that device and ignore the devices chosen on the MT-32 and MIDI tabs. If Preferred device or Music device is set to and ScummVM chooses either an MT-32 or General MIDI device automatically, the settings on the MT-32 or MIDI tabs also apply, and the devices selected on these tabs are the ones that will be used. When set to, ScummVM will automatically choose the most appropriate option for the played game. This device can be an emulated sound device or a software synthesizer, or an actual hardware device such as a soundcard or a hardware MIDI synthesizer. The Preferred device in the global settings Audio tab, or the Music device in the game-specific settings Audio tab, specifies the device that ScummVM uses to output audio. How do the audio settings work together? ¶ This guide expands on the information contained on the audio settings page. ![]() General MIDI device emulation (FluidSynth).How do the audio settings work together?.
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