When two or more parts containing timbres with slightly different pitches are laid over each other, interaction occurs to produce more glossy and richer sounds. The effect can be observed most apparently when a detuned part is layered over the base. Listen to the electric piano in MA Sound Demo031 to learn how the detuned part added in the second half creates the glazed sounds.

The pitch of the detuned part must be deviated in order to achieve this effect. This can be accomplished by entering the pitch-bend data in the first bar of the track containing the detuned part, or in the first bar of the detuned part, and change the pitch slightly.

Adding cyclic swings to your music can also create interaction, where sounds can be transformed. Being a little different from detuning, a cyclic swing, known as "vibrato", produces the "chorus effect" when it is added on layered sound. The chorus effect provides music with swing and gloss. Vibrato is well matched with pads as observed in MA Sound Demo032.

To obtain the "chorus" effect, input the Control Change No. 1 Modulation instead of pitch-bend data. This will constantly add the vibrato effect. But the timbre data must be set so that modulation can control the depth of vibrato effect. Using the control change is a more effective way than using the pitch bend because of its smaller data size, especially in the circumstance where data size is limited.

Echo is a well-known effect to add depth on the sound. In fact, echo is reverberation that comes after the original sound. Producing two parts with the same phrase and playing one of them slightly after the other can emulate the echo effect. This technique is the most effective to the melody part.

The latter half of the melody part in MA Sound Demo033 was tuned with echo effect. Detuning and vibrato effects are also added since they work so nicely with echo effect.

Most mobile phones have a monaural speaker, however, SMAF sound source consists of stereo source. Normally, panning various parts to right and left to produce stereo sound. Even monaural speaker can create pseudo stereophonic sound when the echo and vibrato effect that introduced above are added.

Pseudo stereophonic sounds can be produced easily by panning an original part and the other sound to right and left. The sounds spread to left and right when there is a detuning/chorus effect. The sounds move from left to right in when there is an echo effect.

In MA Sound Demo034, pseudo stereo effect is added to the backing parts and the echo effect is added to the melody parts to create the impression of stereo and movement.