Ask a Continuum player why their instrument feels different from an MPE keyboard and you will get answers about the playing surface, the three axes, the fingerboard. All true. But a large part of the answer is invisible: it lives in the transfer functions buried in the EaganMatrix, and it is the part of expressive instrument design that almost nobody talks about.

Haken Audio has been quietly extending exactly this layer. Firmware 10.73 — the current release, dated 27 April 2026 — adds new transfer function shapes to two core EaganMatrix modules and ships 32 new and improved WARBL-specific default user presets for the EaganMatrix Micro.

It is a small changelog. It is also a good excuse to explain something that matters to every MPE player, not just Continuum owners.

What a Transfer Function Does

When you press into a key or a fingerboard, the instrument produces a number. Call it 0 to 1. A transfer function is what sits between that number and whatever it controls.

The naive approach is a straight line: 0.5 of pressure produces 0.5 of brightness. That almost never feels right. Human force perception is not linear, physical instruments are not linear, and the useful part of most synthesis parameters is not evenly distributed across its range. A filter cutoff mapped linearly to pressure spends most of its travel in a region you do not want and crams everything musical into the last few percent.

So instruments bend the curve. An exponential curve keeps the low end gentle and lets you dig in at the top. A logarithmic curve does the reverse — immediate response, then diminishing returns, which suits amplitude. An S-curve flattens both extremes and concentrates resolution in the middle, which is where most playing actually happens.

Get this right and an instrument feels responsive and controllable. Get it wrong and the same hardware, the same sensors and the same synthesis engine feel twitchy, dead, or impossible to play quietly. Transfer functions are the difference between an instrument that works and one that fights you.

What 10.73 Adds

Firmware 10.73 extends the transfer function choices in two places.

Formula X gains Graph and Offset Graphs as transfer function options. A graph-based transfer function is the most flexible form there is: instead of choosing from a menu of named curves, you draw the relationship you want. Offset graphs add a shifting reference point, which is how you build responses that behave differently depending on where in the range you started.

Formula XYZ and Blend gain a "Steep S" option — a more aggressive S-curve than the standard one. Steeper shoulders mean a larger dead zone at the extremes and a much more sensitive middle. For a fingerboard instrument where you want a firm floor and a firm ceiling but fine control in between, that is a genuinely useful shape.

None of this is glamorous. All of it changes how the instrument feels under your hands.

The WARBL Presets

The second half of 10.73 is aimed at a specific and growing user group: WARBL players driving the EaganMatrix Micro. The WARBL is an electronic wind controller, and the EaganMatrix Micro is the compact version of Haken's synthesis engine — a pairing that turns breath-and-finger playing into full EaganMatrix synthesis.

Wind controllers need different default mappings from fingerboards. Breath pressure is continuous, single-voiced and has its own dynamic curve; the presets that make a Continuum sing are the wrong starting point. Thirty-two dedicated presets means a WARBL player can get to a playable sound without first learning the EaganMatrix editor, which has a reputation — earned — for being deep.

Who the Update Covers

According to Haken, 10.73 applies to devices with 2x, 6x and 8x EaganMatrix engines, all ContinuuMinis, and all EaganMatrix modules. That is a wide net: Continuum fingerboards, the ContinuuMini, the Eurorack EaganMatrix Module and the Micro all run the same synthesis engine, which is why a single firmware release touches such different instruments.

The Takeaway for Everyone Else

You do not need a Continuum to use this. Most MPE-capable plugins expose curve controls somewhere — a response shape on pressure, a sensitivity setting on slide, a bend curve. They are usually defaulted to linear and usually ignored.

If an MPE patch feels unresponsive at low pressure, or if you find yourself unable to play quietly without the sound dropping out entirely, the mapping curve is the first thing to check — before you reach for a different controller or a different plugin. The hardware is rarely the problem. The line between your finger and the parameter usually is.

More information: Haken Audio editor and firmware