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SP-12 Librarian User’s Manual Behind The Scenes

Water’s Edge Software

Page 17

Behind The Scenes

This section gives you a little background on how the SP-12 Librarian

does its magic, as well as providing technical information for those

who are interested.

“Fail Safe” File Management

Whenever the SP-12 saves sounds or sequences to an existing

sound or sequence file, the SP-12 Librarian takes an additional step

to ensure that the original data is not erased until a valid replacement

has been obtained.

The following is done automatically when you update an existing

sound or sequence file with new SP-12 data:

• The SP-12 Librarian tries to create a temporary work file on the

same disk as the original file. The work file is about 192K for sound

files, and 49K for sequence files. If there is not enough room on

that disk, it tries to create the work file on the startup disk. If it can’t

find enough room on the startup disk, a “Disk is full” error occurs

and the process is canceled.

• The SP-12’s data is saved in the work file. If any problem occurs,

such as a faulty disk or aborting the operation by pressing “No” on

the SP-12, the operation is halted. Your original file is still intact.

• After the SP-12 has completed writing its data to the work file, the

work file is copied into the original file, thereby replacing the old

data with the newest SP-12 data. If any problem occurs during the

copying, the original file’s data will be corrupt and the work file will

contain the SP-12’s newest information. A dialog will inform you of

this. In this case, the work file will be called “SP-12 Librarian #

”

(where

is a number from 1 to 99).

• If all goes well, the work file is deleted.

The Fail Safe File Management system does have a drawback. If you

don’t have a hard disk and there is insufficient room on either floppy

for a work file, SP-12 Librarian will not let you save the SP-12’s

information. You can get around this by saving your file on another

disk, then copying it to the correct floppy using The Finder.

MIDI Problems

The SP-12 Librarian automatically checks all its incoming MIDI data

for invalid commands and data. Furthermore, it verifies the files it

generates to make sure they contain what they’re supposed to.

The only thing the SP-12 Librarian can’t automatically check is MIDI

data that has been corrupted while in transit between the SP-12 and

the Macintosh. This problem can be attributed to either physical

damage (bad MIDI cables or connections) or electromagnetic

interference. Observe these general rules to reduce the likelihood of

MIDI data errors:

• Keep your MIDI cables away from AC power lines and sources of

strong Radio Frequency Interference (RFI), such as the left side

and upper-left corner of compact Macintoshes like the 512KE,

Plus, SE, SE/30, Classic, Classic II, Color Classic, etc.

• Try to keep your MIDI cables relatively short (about 6 feet long).

• Don’t step on your cables, MIDI or otherwise. This shortens their

life considerably.

In actual tests, we found that 10-foot premium quality MIDI cables

never failed us. Once you establish a fixed MIDI setup and get the

glitches out, you probably won’t bother to verify your SP-12’s sound

or sequence files.

Software Pirates

Many music-related applications use copy-protection schemes to

discourage software pirates. Unfortunately, this also complicates life

for legitimate owners in a variety of ways.

Water's Edge Software creates software with no copy-protection.

This is done for one reason only:

to let legitimate licensees use our

software products more easily

We give you an excellent value by combining quality software with

comprehensive documentation, all for a

very

reasonable price. We

think this is a fair way of doing business.

If you make illegal copies of this program, or if you

a pirated

copy from someone else, you are jeopardizing the future of this

project and all projects that may follow. We just can’t provide this

service at a financial loss!

Vote with your dollars… If someone’s software is good enough for you

use

, it’s good enough to be used

fairly

. Please, don’t pirate

programs.

Author

The SP-12 Librarian was designed and created by Steve Makohin.

We thank the people at E-mu Systems for their help. Special thanks

to Les Titze for his technical assistance and his useful suggestions.

The Manual

The SP-12 Librarian User’s Manual was designed and written by

Steve Makohin on a Macintosh using:

• Microsoft Word™ 5.1a word processor for text and layout

• Claris MacPaint™ for pictures (screen snap-shots)

• Claris MacDraw™ for drawings

Each “SP-12 Librarian User’s Manual” is a laser printed original

document.

Programming

SP-12 Librarian is written using THINK Pascal™ to produce a

compact, fast executing program.

To reduce development time, we used the “Standard Utilities

Package,” a toolbox enhancer (by Water's Edge Software).

Machine language MIDI I/O routines from MidiPascal™ (by Altech

Systems) are used to communicate with the Macintosh’s MIDI

interface.

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