Chapter 9 Connecting External Devices

Selecting the Transmit Channel

(Tx. Channel)

MIDI organizes things into “channels,” which are numbered from 1 through 16. Simply connecting a cable is not enough for communication to take place. The connected devices must be set to use the same MIDI channels. Otherwise, no sound will be produced, and no sounds can be selected.

Select the transmit channel (1–16) of the KF-90.

The channel setting is at “1” when the KF-90 is powered up. If the keyboard has been split into right-hand and left-hand sections, messages from the left-hand section are not sent.

The KF-90 receives messages on all channels from 1 through 16.

Disconnecting the Internal Sound Generator and

Keyboard (Local Control)

When connecting a MIDI sequencer, set Local Control to “off.” The setting is at “Local Control ON” when the KF-90 is powered up.

As illustrated, information describing what has been played on the keyboard is passed to the sound module over two different routes, (1) and (2). As a result, you hear overlapping or intermittent sounds. To prevent this from happening, route (1) must be severed, by setting the unit to what is known as “Local Off.”

(1)Local On

 

 

Sequencer

Sound

MIDI

MIDI

IN

OUT

Generator

 

Memory

 

 

 

MIDI

MIDI

 

OUT

IN

(2) Soft Tru On

Each note played is sounded twice

Local On: The keyboard and internal sound generator are

connected.

Sound is emitted

Sound Generator

Local On

Local Off: The keyboard and internal sound generator are separated. No sound will be produced by the keyboard when it is played.

No sound produced

Sound Generator

Local Off

When connecting a unit in the Roland MT series, you don’t need to switch off Local Control. MT units transmit Local Off messages when their power is switched on. If you first switch on the KF-90, then the MT-series device, Local Control is automatically switched off on the KF-90.

Sending Recorded Performance Data to a MIDI

Device (Composer Out)

When Composer Out is active, you can send performance data recorded with the KF-90 to a connected MIDI device or computer.

When you turn on the power, this is set to “OFF” (data is not sent).

Sending Tone Change

Messages (Program Change/ BankSelect MSB/BankSelect LSB)

A Program Change is a message that means “change to the tone of the specified number.” The device that receives this changes to the tone of the corresponding number.

When you choose a Program Change message (Program Number), the Program Number will be transmitted to the MIDI device connected to the KF-90. The MIDI device that receives the Program Number changes the tone to the corresponding Program Number.

Normally, the Tone is selected from the 128 Tones available. Some MIDI devices, however, have more than 128 Tones. With such devices, the Tone is selected through a combination of Program Change messages and Bank Select messages. There are two parts of a Bank Select message: the MSB (Controller 0, with a value of 0–127) and the LSB (Controller 32, with a value of 0–127).

*Some MIDI instruments can’t handle Bank Select messages. Others can handle Bank Selects, but do not recognize the LSB part.

If you want to know more about how sounds are changed upon reception of Program Change messages, please see “MIDI Implementation” (Sold seperately).

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Roland KF-90 owner manual Selecting the Transmit Channel Tx. Channel, Sending Tone Change, 158

KF-90 specifications

The Roland KF-90 digital piano is a remarkable instrument that stands out in the crowded field of portable keyboards. Known for its versatility, the KF-90 is designed for both novice and experienced musicians, providing a wide range of features that make it a perfect choice for practice, performance, or composition.

One of the standout features of the KF-90 is its weighted hammer action keyboard. This innovative key mechanism simulates the feel of an acoustic piano, offering the player a more authentic touch and response. The keys are designed to respond to subtle nuances in playing dynamics, allowing for expressive performances across various genres of music.

The KF-90 boasts an impressive library of sounds, including a rich array of acoustic piano voices, electric pianos, string instruments, and synthesizers. With over 300 built-in tones, musicians will find endless possibilities for creativity. Additionally, the onboard sound engine leverages advanced sampling technology to ensure that the sounds produced are high quality and accurate.

For those looking to enhance their performance, the KF-90 includes a range of digital effects, such as reverb and chorus, which enrich the overall sound. This makes it easy to create depth and atmosphere in compositions. The instrument also features a multi-track recording function, enabling users to layer sounds and create complex arrangements directly on the piano.

Connectivity is another key aspect of the KF-90, as it comes equipped with USB MIDI, allowing for seamless integration with music software and other digital devices. This feature is especially valuable for composers looking to utilize advanced production techniques or for educators who wish to incorporate technology into their teaching methods.

The KF-90 is designed with portability in mind, featuring a lightweight construction and a sleek, modern design. It includes built-in speakers for convenient playability, but can also be connected to external speakers or headphones for a more immersive experience.

Overall, the Roland KF-90 digital piano is a fantastic combination of traditional piano aesthetics and modern technological innovation. Its weighted keys, extensive sound library, and connectivity options make it a versatile instrument suitable for musicians of all skill levels, whether for practice, recording, or live performances. With the KF-90, Roland continues its legacy of creating high-quality musical instruments that inspire creativity and encourage musical exploration.