Comparison

dspMixFx vs Comp 609

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

dspMixFx

This app provides latency-free monitoring and control of DSP features for compatible Yamaha audio interfaces on iOS devices. It enables access to effects like REV-X reverb and Guitar Amp Classics, enhancing your audio production workflow.

Highlights
  • Control DSP mixer and effects
  • Latency-free monitoring
  • REV-X reverb
  • Sweet Spot Morphing Channel Strip
  • Guitar Amp Classics
Read full description

Together with the UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824 audio interfaces, the dspMixFx app allows you to utilize the benefits of Yamaha’s custom-designed SSP2 DSP chip directly on your iPad and iPhone. The dspMixFx app is free of charge, providing latency-free monitoring while running the highly acclaimed REV-X reverb, the Sweet Spot Morphing Channel Strip and Guitar Amp Classics with other iOS audio apps. Please note that this app is only a control application for Steinberg’s USB audio interfaces UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824. Without a UR interface it can be used in demo mode only. Find more information about the UR audio interfaces at: http://www.steinberg.net/en/products/audio_interfaces/ur_series Find more information about the UR-RT audio interfaces at: http://www.steinberg.net/en/products/audio_interfaces/ur-rt_series Make sure to download and install the firmware update version 2.10 first for UR44, UR28M and UR824 to enable the UR interface to run together with the dspMixFx app. You can find the firmware update at: http://www.steinberg.net/en/support/downloads Key features • Control of all DSP features like DSP mixer and DSP effects • No-latency DSP-powered monitoring with the iPad and iPhone • Works with UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824* * Units need to be switched to class compliant mode to run with the iPad via the iPad Camera Connection Kit, the Lightning to USB Camera Adapter or the Lightning to USB 3 Camera Adapter. In CC mode Loopback capability is disabled and only the analog inputs and outputs are available on UR28M and UR824.

About

Comp 609

This audio effect plugin emulates analog compressors, offering extensive control over attack, release, ratio, and saturation. It supports various operation modes, external sidechaining, and parallel compression for detailed audio shaping. A demo version is available with a time limit.

Highlights
  • Analog compressor emulation
  • Adjustable attack, release, and ratio
  • External sidechain with high-pass filter
  • Multiple operation modes (M/S, Stereo, Mono)
  • Parallel compression
  • Oversampling and 64-bit processing
  • Scalable GUI
Read full description

Comp 609 AUv3 plug-in — comes as time-limited Demo-version for you to try. It gives you 5 minutes of Free play time. (You can reload the Comp 609 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of Comp 609 AUv3 plug-in comes as In-App Purchase. FEATURES: • 6 Attack, 9 Recovery (Release) and 5 Ratio selections; • External Sidechain and Sidechain signal High-pass filter; • 6 operation modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono); • Parallel compression; • 8x Oversampling and 64-bit floating point processing; • Undo/Redo; • A/B comparison; • 2x/4x/8x Upsampling; • Macro controllers; • Built-in Gain Match; • Scalable GUI. COMPRESSOR SECTION: • Threshold determines how much compression will occur. When the input signal exceeds the Threshold level, the compressor engages. A smaller value results in more compression. The available range is from -20 dBu to +12 dBu; • Attack determines how fast limiting will engage when the signal exceeds the limiter Threshold. The available values is from 1 to 6; • Recovery (Release) is the time it takes for the compressor to stop processing after the signal drops below the Threshold value. The available values are 40, 80, 100, 400, 600, 800, 1000, 1500, 2000 ms; • Ratio — this control determines the compressor ratio. The available values are 1.5:1, 2:1, 3:1, 4:1 and 6:1; • Sat. On — this toggle switch enables the Analog Saturation. The saturation has no effect unless this switch is in the «On» (down) position. MASTER SECTION: • SC-Filter — the Sidechain Filter controls the cutoff frequency of a low-cut filter on the compressor control signal Sidechain. The available range is 30 Hz to 240 Hz and Off; • Input Gain controls the signal input level to the plug-in; • The Makeup control increases the signal level out of the compressor to compensate for reduced levels as a result of compression. The available range is -20 dB to +20 dB. The Makeup control does not affect the amount of compression; • Mix — the output balance between the signal processed by the plug-in and the original dry source signal can be adjusted with the Mix control. Mix facilitates parallel compression techniques without having to create additional routings in the DAW; • Comp. In — this toggle switch enables the compressor. The compressor has no effect unless this switch is in the «In» (down) position. • Mode — compressor can operate in six modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono). This switch determines the active mode. To use Comp 609 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — Comp 609 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

Screenshots

dspMixFx4 screens
Comp 6094 screens

Verdict

The call

The clearest difference is review sentiment: Comp 609 at 88% against dspMixFx's 29%. Comp 609 also leads on rating (4.8 vs 3.7). dspMixFx's advantage is in-app purchases (none vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Comp 609 sells 1 one-off in-app purchase. dspMixFx asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Comp 609 holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 9 and 25 respectively. Written reviews point the same way: 29% of dspMixFx's written reviews are positive against 88% of Comp 609's.

UpkeepUpdate frequency

dspMixFx ships an update every 11 months, Comp 609 every 7 months. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

Scorecard4 real differences · 6 level
dspMixFx versus Comp 609: the parameters behind the verdict, then further details
ParameterdspMixFxComp 609
PriceFreeFree
Rating3.7 (9 ratings)4.8 (25 ratings) — better
Positive reviews29.2% of reviews87.5% of reviews — better
Number of ratings925 — better
Update frequencyEvery 11 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better10.0
Further details — not scored
Size53 MB21 MB
Age rating4+4+
DeveloperSteinberg Media Technologies GmbHRRS, OOO

Customer experience

dspMixFx

All ratings9 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews48 reviews
Positive29.2%
Neutral6.3%
Negative64.6%

Comp 609

All ratings25 ratings
Positive96.0%
Neutral0.0%
Negative4.0%
Written reviews8 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

In-app purchases

None

dspMixFx

No in-app purchases

1 purchases

Comp 609

One-time1
  • RRS Comp 609 Unlimited$4.99

Questions

Is dspMixFx free?
dspMixFx is free to download, with no in-app purchases.
Is Comp 609 free?
Comp 609 is free to download, with in-app purchases available.
Which has better reviews, dspMixFx or Comp 609?
Comp 609 is rated higher. dspMixFx averages 3.7 out of 5 from 9 ratings, while Comp 609 averages 4.8 from 25 ratings.
Do dspMixFx or Comp 609 have ads?
Neither dspMixFx nor Comp 609 shows ads.
Which is updated more often, dspMixFx or Comp 609?
dspMixFx ships an update every 11 months, and Comp 609 every 7 months. Most recently, dspMixFx was updated on October 8, 2026 and Comp 609 on September 30, 2026.

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