furnace/doc/2-interface/song-info.md

song info

• "Name" is for the track's title.
• "Author" is used to list the contributors to a song. If the song is a cover of someone else's track, it's customary to list their name first, followed by [cv. YourName].
• "Album" can be used to store the associated album name, the name of the game the song is from, or whatever.
• "System" is for the game or computer the track is designed for. This is automatically set when creating a new tune, but it can be changed to anything one wants. The "Auto" button will provide a guess based on the chips in use.

All of this metadata will be included in a VGM export. This isn't the case for a WAV export, however.

"Tuning (A-4)" allows one to set tuning based on the note A-4, which should be 440 in most cases. Opening an Amiga MOD will set it to 436 for hardware compatibility.

subsongs

This window allows one to create subsongs – multiple individual songs within a single file. Each song has its own order list and patterns, but all songs within a file share the same chips, samples, and so forth.

• The drop-down box selects the current subsong.
• The + button adds a new subsong.
• The − button permanently deletes the current subsong (unless it's the only one).
• "Name" sets the title of the current subsong.
• The box at the bottom can store any arbitrary text, like a separate "Comments" box for the current subsong.

speed

There are multiple ways to set the tempo of a song.

Tick Rate sets the frequency of ticks per second, the rate at which notes and effects are processed.

• All values are allowed for all chips, but most chips have hardware limitations that mean they should stay at either 60 (approximately NTSC) or 50 (exactly PAL).
• Clicking the Tick Rate button switches to a more traditional Base Tempo BPM setting.

Speed sets the number of ticks per row.

• Clicking the "Speed" button changes to more complex modes covered in the [grooves] page.

Virtual Tempo simulates any arbitrary tempo without altering the tick rate. It does this by adding or skipping ticks to approximate the tempo. The two numbers represent a ratio applied to the actual tick rate. Example:

• Set tick rate to 150 BPM (60 Hz) and speed to 6.
• Set the first virtual tempo number (numerator) to 200.
• Set the second virtual tempo number (denominator) to 150.
• The track will play at 200 BPM.
• The ratio doesn't have to match BPM numbers. Set the numerator to 4 and the denominator to 5, and the virtual BPM becomes 150 × 4/5 = 120.

Divider changes the effective tick rate. A tick rate of 60Hz and a divisor of 6 will result in ticks lasting a tenth of a second each!

Highlight sets the pattern row highlights:

• The first value represents the number of rows per beat.
• The second value represents the number of rows per measure.
• These don't have to line up with the music's actual beats and measures. Set them as preferred for tracking. Note: These values are used for the metronome and calculating BPM.

Pattern Length is the length of each pattern in rows. This affects all patterns in the song, and every pattern must be the same length. (Individual patterns can be cut short by 0Bxx, 0Dxx, and FFxx commands.)

Song Length shows how many orders are in the order list. Decreasing it will hide the orders at the bottom. Increasing it will restore those orders; increasing it further will add new orders of all 00 patterns.