Roland SC-88 Pro User Manual download pdf (Page 20)

Chapter Three, Implementing

The Solution - Step by Step

Implementing compatibility:

We started Chapter Two with a list of the obstacles to compatibility. Let me repeat them again:

Three obstacles to compatibility:

1. New features limit backward compatibility.

2. Change in bank switching methods.

3. Use of map 0.

Once you understand obstacles 2 and 3, their solution, and how they affect MIDI playback,

you can figure out your own approach to resolving it. But many Sound Canvas readers did not

want to be required to understand hexadecimal math, LSB & MSB terminology, indirect

addressing, and various other concepts. Most Sound Canvas users just want to know, “What

do I do?”

So, in this chapter we will look at each Sound Canvas one generation at a time. There is only

one good solution to the problem being recommended in this document but there are several

ways to implement it. Since among us we use many different sequencers, each of us may need

to use an approach that others can not use.

Of the sequencers in use I have narrowed the way they select sounds down to three ways. Your

sequencer either does bank switching methods for you, or it allows you to do the bank

switching yourself. The third possibility is the sequencer that will do a hybrid approach.

Below I will show you step by step for each generation of Sound Canvas how to “correct” your

files for upward compatibility. I will show you three ways to do it.

Using Methods

This is for sequencers that do bank switching for you requiring from you the three parameters of

a single bank number, a bank method , and a patch number. The advantage of this is that each

bank regardless of map will have its own unique number. Furthermore, all the information

required is embedded into every patch call.

The disadvantage is that the bank numbers you use are not found in the Roland manual but have

to be calculated by multiplying the controller #0 value by 128 and adding the controller #32

value.

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Roland SC-88 Pro User Manual Page 20