Universal VTPO Sound Font Project
Recommendations for Sound Font Sample Recording Needs
I'll try to lay out some basics here so that we have some common ground to work on.
S/N ratio: Recording equipment should have a 60 db or better, 85 to 100 db prefered
Each sample to contain 2 seconds of "silence" (ambiant chamber noise) in between each sample. This quite area between notes is used to get a baseline on ambient noise and speech characteristics and acoustic reverb for the chamber for noise removal.
Tuning: Rank should be in a reasonably good state of tuning and regulation if possible. Minor tuning errors are OK as long as they aren't completely off pitch for the pipe. Each sample should contain a minimum of 4 to 6 seconds of steady state sound.
Required: Pipe ranks sampled without tremolo one sample for every note in rank.
Strongly suggested: Record the entire rank again with tremelo on with 4-6 second samples with 2 seconds of off time in between samples.
Preferred: Dry samples no ambient reverb except for the chamber itself see preferred Microphone placement 1 & 2 below.
High quality Omni directional Electric Condenser or PZM (Pressure Zone Microphone), Frequency response of 20 - 20 kHz.
Preferred: Include a frequency response chart for each microphone used if possible.
Strongly suggested that microphones be placed behind a nylon mesh wind and pop screen, no wind boot or socks around the mics if possible. Microphones should be isolated from vibration.
1st Preference: Microphone placed approximately 3 to 4 feet from the center of the chest, Elevate microphones about 1 foot above the average mouth location of the pipes, swell shades closed. X-Y pattern for mic placement. (X-Y = Right mic points to the left side of the chest, Left mic points to the right side of the chest.
2nd Preference: Microphones placed just inside of the closed swell shades 1/4 length from each side, height should be close to the middle of the shade if possible X-Y Pattern.
3rd Preference: Microphones placed just in front of or in between the fully open swell shades 1/4 length from each side mid way up the shade for L / R microphones.
Preferred recording method: Direct to disk digital, or DAT 24 bit 96 kHz sample rate preferred, 16 bit 44khz sample rate minimum. Alternate: high quality analog tape is OK since I can eliminate the tape hiss with my software.
Recording level must be set at a fixed level. Adjust so that the loudest pipe is at but does not exceed 0 vu on the recorder or about 80% of maximum recording level. No compression, limiters or filters of any kind.
Optional: If possible include a short recording of the rank with the microphones placed in a central part of theatre that represents the best overall listening location for the venue. Play the rank with and without tremolo, also include some chords played across the ranks "sweet range".
If anyone has other suggestions please let me know.