Life Update (Dec 23, 2025)

Hello!
I’m Jooyoung Kim, a mixing engineer and music producer.

The weather has suddenly gotten much colder these days—hope everyone is staying healthy.

As for me… I caught a pretty bad cold and honestly, it’s been rough.

It’s been a while since I last wrote a post, so normally I’d pick a proper topic and organize my thoughts.
But today I’m a bit worn out, so I’ll just keep this as a simple life update.

First, a paper I submitted on a relatively straightforward topic was rejected by JASA.

Rejection itself is nothing new, so that part didn’t bother me too much—but it was a desk rejection that took two months, which honestly stung a little.

As soon as I saw the decision, I resubmitted the work to JAES, since I had already prepared a version in that format. If it doesn’t work out there, well… there are other options. I’ll just have to wait and see.

Next, I sold my HA73EQ and picked up the HA73EQX2.

I’ve been consistently satisfied using it for recording, tracking, and EQ work,
and I’d been wanting to do more stereo tracking as well.

I did consider the Phoenix Audio Ascent, since the price was appealing,
but on the EQ-equipped model, the mic input and line input aren’t separated—which ultimately led me to choose this unit instead.

Of course, I could work around that with a patchbay,
but if phantom power is engaged and a patch cable gets bumped or shorted… well, that could be the end of a very precious microphone..^^;;

I’ve already finished all the measurements on this unit,
so I’ll write a proper review when I get the chance.

Also, the headband on my main headphones finally gave up.

I’ve been using the Ultrasone Pro 2900,
and while replacement earpads are easy to find, I couldn’t find anyone selling just the headband.

In the end, I ordered some Velcro and a headband cushion from AliExpress and fixed it up myself—simple and effective.

And after a very long time, I finally traveled to Japan again.

Actually, now that I think about it, this was my first real trip in ages.
The last time I traveled was around April 2019, to Sapporo—so that makes it about six years and eight months.

I visited Kyoto and Osaka. Kyoto, in particular, stood out for its clean air, mountains, and nature. The farther you go from the city center, the more rural it feels—it reminded me of visiting my grandmother’s house when I was younger.

On the way back after visiting a temple, I came across a small jazz band I’d never heard of before.

I found myself thinking, “Wow, that’s a really compact kick drum—interesting,” as I watched them play. The sound level was comfortable and easy to enjoy, which made the whole experience even nicer.

In Osaka, I visited the famous Osaka Castle.

To be honest, though, the inside felt like little more than a concrete museum, which was a bit disappointing.

I also stopped by Miki Gakki to check out and play some acoustic guitars.

Unfortunately, none of them really moved me.
I tried some fairly expensive models too—like the Collings D2H and the Martin D-42—but still didn’t feel that spark.

I suspect the space itself wasn’t ideal for evaluating guitars acoustically, which may have played a big role.

As for the cold—it probably came from walking long distances during the trip,
and then continuing to work on paperwork back at the hotel without much rest. The fatigue caught up with me.

Please take good care of your health,
and I hope everyone finishes the year safely and peacefully.

I’ll see you again in the next post. ^^

Lewitt Space Replicator Year End Sale (~50% off, until 4 Jan)

Hi! This is Jooyoung Kim, a mixing engineer and music producer. Today, I’ll introduce a room/headphone simulator, Space Replicator made by Lewitt.

I received the NFR code for this product from Plugin Boutique for this review, and if you purchase the plugin using the links included in this article, I’ll earn a small commission that helps me keep going…!

Let’s start!

Space Replicator is a plugin that uses HRTF (Head-Related Transfer Function) modeling to allow you to experience sound with a sense of spatial depth, making it sound like real acoustic space when listening through headphones or earphones.

While there are indeed several plugins offering similar virtual monitoring functions, and some competitors boast larger headphone/earphone catalogs, Space Replicator’s distinct advantage lies in its specialized focus on HRTF and the process of creating personalized binaural profiles.

If you select a headphone or earphone model that you own and that is supported by LEWITT, you can generate a personalized binaural profile through a few simple steps. Although the results may not be perfectly precise, the effect was noticeably effective when I tested it.

Furthermore, the plugin features 12 different virtual spaces, each offering various listening perspectives or speaker options, and it also provides 6 different headphone simulations.

My favorite virtual space is the Vienna Synchron Stage A, which accurately provides the acoustics of far-field speakers. Since small studio producers and engineers usually can’t access such a setup—and neither can I—this particular feature offers me a tremendous amount of practical things.

It is currently 50% off until January 4, 2026. Therefore, if you work in a space with acoustic limitations, I highly recommend this plugin.

That’s all for today. See you in the next post!

I bought microKORG XL (older version) and Bolanle passive stereo DI box

Hello! This is Jooyoung Kim, a mixing engineer and music producer.

Recently, I bought a small portable synthesizer: the microKORG XL. KORG currently sells the microKORG XL+, but this discontinued version has a very reasonable price on the used market (just about $140 in Korea!), and its sounds are still perfectly usable.

The keys are made of cheap plastic. However, I can connect an external controller via a MIDI cable or transmit MIDI data via a USB cable.

It also has an external audio input, such as a microphone or line input, which can be used for the vocoder function.

There are two kinds of outputs, unbalanced L/R and headphones, which are very convenient to use.

The synth has 8 categories/genres and 2 selectable banks. Therefore, a total of 8 X 8 X 2 = 128 preset programs are available.

But I’m really disappointed by the microKORG XL editor software provided by KORG. It’s no longer usable, and I cannot even install the program on my Mac system.

Also, I have microphone preamps but no DI box. So, I decided to purchase a stereo DI box. However, you might realize I’m not an affluent musician if you’ve been following my posts. After some web searching, I found a cheap DI box made by Bolanle (just $33!) being sold on Aliexpress.

I really didn’t have high expectations for this gear because of its price, but surprisingly, the build quality is great!

I can’t say I love all of the sound presets on the microKORG XL. However, I am particularly fond of one lead sound preset and one keyboard sound preset. The vocoder function is quite valuable as well.

Now I am eager to get a full analog multi-voice synthesizer. Music making always drains my wallet!

That’s all for today. See you in the next post!

Basics of Synthesizers (8) – Phase Distortion Synthesis

Hello! This is Jooyoung Kim, a mixing engineer and music producer. Today, I’ll talk about the phase distortion synthesis method and synthesizers.

This post includes a few affiliate links. If you make a purchase through them, I may receive a small commission, which helps me keep writing…^^

In my last post, “Basics of Synthesizers (4) – Modulation Synthesis and FM,” I mentioned that Yamaha’s DX7 was called an FM synthesizer, but in reality, it uses phase modulation synthesis. Also, I already explained the phase modulation in short. Therefore, I will not discuss phase modulation further.

However, there is one more signal synthesis method, Phase Distortion (PD), invented by Casio, which uses the phase of the signal. Its principle is similar to that of Phase Modulation, which was invented by John Chowning.

The picture illustrates how the PD method works. First, you can see that the basic frequency counter resets to zero after a certain period – (a).

There is also another frequency counter with a slightly higher frequency than (a), which resets to zero when the (a) signal resets to zero – (b).

(b) signal is used the phase value of the sine signal – (c).

The inverted base signal (a), which is used as a windowing function that goes to zero at the end of the period -(d).

The final output signal obtained by multiplying (c) by (d). This multiplication levels out the sudden jump in (c), resulting in a smooth, filtered PD waveform – (e).

The Casio CZ series was the hardware synthesizer to which the PD method was applied.

The Casio XW series also featured the PD method in its synthesis engine.

Phase Distortion (PD) method hardware synthesizers are not sold by other companies besides Casio. Therefore, if acquiring the real hardware is too expensive or inconvenient, using software emulations like Arturia’s CZ-V is a handy alternative.

That’s all for today. See you in the next post!