Buying a Digital Piano Pedal: Sustain Pedals for Digital Pianos

Every piano has three pedals: soft, sostenuto, and sustain – what else is there to know? Quite a lot actually! Especially if you want to buy a digital piano pedal as an accessory. Sustain pedals in particular vary greatly in price.

Unlike it is the case with acoustic or grand pianos, the mechanical pedal action of a digital piano is electronically converted into sound. On the one hand, this offers a wide range of possibilities that vary depending on the price range of the instrument.

On the other hand, there are some differences to keep in mind, especially when buying external digital piano pedals as accessories. To be on the safe side, rely on original accessories. Universal accessories are often much cheaper – but you have to choose carefully here.

A triple digital piano pedal is standard, but …

Home pianos typically have three pedals that perform the basic functions listed above. However, you can assign different functions to some pedals using the piano controls. Examples include controlling effects or turning pages of digital sheet music when playing with a tablet. For portable pianos, stage pianos, or master keyboards with a piano keyboard, however, you need to know exactly which pedal type is appropriate.

Why buy a digital piano pedal as an accessory?

Digital pianos usually come equipped with pedals. However, cheaper models often do not include a real pedal but a simple foot switch. This is better than no pedal at all but it creates a different playing experience. For example, these little buttons slip away easily, squeak at times, and all in all can’t provide the pedal feel of a piano.

Piano pedals vary in design and polarity and come as a simple switch or a continuous controller. What does all that mean? While it’s not that difficult, as so often the devil is in the details here.

Digital piano pedal: single or triple?

Portable instruments usually come with a single sustain pedal. This is the minimum configuration and sufficient for the time being. However, if you want to play with three pedals and have more expressive possibilities, you need to invest in an upgrade. Of course, it makes little sense to buy three single pedals. There are double pedals and triple pedals – again, there are many differences.

Triple pedal with universal connector

Whether or not a multi-pedal will fit depends on the connector – universal pedals have jack plugs at the ends of their cables. As shown here with the Roland RPU-3, all three pedals are designed as continuous controllers and are therefore half-pedal capable.

Sustain pedals with special connector

Original accessories often have special multi-pin connectors that do not fit other manufacturers’ instruments. An example of this is the Casio triple pedal unit. Although you can use the SP-34 with various Casio digital pianos, the special connector does not allow use with other brands.

Sustain Pedals: Look for the half-pedal function!

It is definitely a good thing if the sustain pedal on your new digital piano looks like a piano pedal. However, this does not necessarily mean it has the same expressive capabilities. A half-pedal function is important to control the pedal effect just as you would on an acoustic piano. This is already standard on mid-range instruments costing 1,000 Euros or more.

Cheaper digital pianos may support a half-pedal function. However, sometimes they come with a simple pedal that cannot carry out this function. While is not a problem for absolute beginners, you should buy a better sustain pedal when starting to play more demanding piano literature – if the existing pedal connector allows for this.

Sustain pedals with half-pedal function – Recommendations

The following pedals have a half-pedal function – recognizable by the “stereo jack plug”. Some pedals have rubber plates you can fold out to prevent the pedal from slipping.

Pedals supporting the half-pedal function at Thomann*

If you are not sure which type of switch your digital piano supports, you should purchase a sustain pedal with switchable polarity. Some of these pedals can also be put into switch mode, which is useful in the (rare) case that a digital piano does not support the half-pedal function.

Pedals with switchable polarity at Thomann*

Sustain Pedal as a switch: Paying attention to polarity

The simplest and cheapest pedals are designed as foot switches. When you press the pedal down, there is an electrical contact. It can be an open or a close contact – this is usually called polarity. It is less about the electrical polarity “plus or minus” and more about the type of contact: Normal Closed contact or Normal Open contact. This is usually indicated on the sustain pedals with N.C. or N.O.

Why should you care about this when buying pedals? Quite simply, many pedals, especially those in the lower price range, are configured at the factory and do not allow adjustment. If you connect a pedal with the wrong polarity, the switching function may still work – but in the opposite direction. Playing the piano that way takes some time to get used to.

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