As long as your tempos are below 200 you’re OK. 
Hi Mr Wilks & PK I will be placing my bid for this tomorrow but I did contact the seller today and asked if it was all working ok, he thinks so but can not be sure as he used it to for something else and not as intended. He has offered to refund if it is not working ok but I cant test it properly as all my equipment packed away for about 6-9 months but can test it on one SL1200 on one side first then the other, Thanks for your help. - Keith
1 Like
No worries @DJKeith
Honestly, it’s exactly what you’re after in every way and as they don’t come up too often, I’d snap it up. What it’s worth is your call but it would solve all your problems and also give you a nice beat offset meter to view as well. Nice!
As far as testing goes, plug in a turntable on one side at a time. You’ll know if it works or not from that.
1 Like
Yes, Elliot and I Developed the Beatkeeper in 1994ish. It was specific to Analog Audio and could not only do a read out, but give you the downbeat, and cross compare like we do in Engine. IN fact you will see later iterations on mixers that are of the 4 beat look and compares. We even made a version never released that have a MIDI output and sent MIDI clock data to your drum machines
At the time this came out the only other option was a device from a friend of mine that did a tapping averaging calculator. There was no DJ software and there was no Pioneer… Pioneer was next to put this in a mixer, and then Roland and a few others.
Oh and how I met Jack O’Donnell, well, Elliot and I launched this product at DJ EXPO 1995, and the Numark team reached out to us interested in bringing our technology to Mixers and CD players. Innovation. DM1635 was the first Mixer and CDN88 was the first auto mixing CD player that actually worked, though Numark had done one earlier and invented the category. I’ve been here ever since.
Everyone should always know your dream job is always possible!
13 Likes
I sold so many of the DM1635 back in the day, TY for you contributions and that was an awesome bit of history!
Yeah, but apart from that…what have the Romans ever done for us?
2 Likes
In 2001 I was using the Axis 8s running a smart loop on a test tone CD, the MIDI hook ups looped through a sequencer / drum machine, tapping the rough BPM I wanted, and manually mixing the Emu using the player start/cue buttons, pitch fader, and jog. Turned an Emu + player into just another DJ deck for me. It was great. Lot of live remixes and working in my goofy little sequences into a set. The beatkeeper and MIDI combination was very useful on a player.
Hi CBR1 Denon Staff You speak of a tapping average calculator this is what I bought two of from Disco Supplies I still have them but boxed and ready to move so not able to check the correct name or send a close up image but I do have this old photo and you can see them one either side of my mixer.
When I bought these there was nothing else on the market so your BPM device could not have been out then, trust me Disco Supplies where very keen to sell me as mush as possible.
They worked by tapping to the beat and as long as the person doing it did it right they where pretty accurate, you would do the intro, vocal, break and so on and put it on a label so that when you played that record you entered the BPM say 115.2 the the sensor on the SL1200 knew how much you changed the deck speed by and displayed what the current BPM was. Yes they where not bad but very time consuming and I just wish I had purchased one of your devices when I could have as I just want a read out as the track is playing.
Lets just hope my bid is successful on Sunday for a second hand one.
Keith
3 Likes
Ooh there’s a Matamp Supernova! Over £1000 in the 80s.
A favourite of Froggy, and installed in a club local to me, so I got to play on one. 
1 Like
This is the kinda content I’m here for.
I’ve never owned one but always wanted one back in the 90s. Seeing you around here and not knowing you were instrumental in bringing this to fruition is sheer awesome.
Thanks for a cracking bit of DJ tech history 
2 Likes
Hi Mr Wilks & PK
A little bit of Triva regarding the Supper Nova Mixer you may or may not find of interest. When I bought this back in the 80s it was part of a complete system but the mixer on it’s own was either £1250 0r £ 1450. cant remember but rather a lot of money back then but the spec left everything else standing.
I had a number of conversations with Mat Mathias the owner of Radio Craft at the time as I was having his Mixer & amp but he did not think my choice of speakers was as good as it could be from what Disco Supplies had told him. Anyway there was a famous DJ back then (sorry forgotten his name) who somehow he knew Mat and he told Mat that there was no good quality DJ mixer around in his opinion. So Mat spent some time designing the supper nova. On the spec it was within 5% studio quality but Mat told me it was near 2½ % You could broadcast from it and it has two out put groups so with independent EQ & volume and the faders are 75mm long.
At the point the mixer was finished the DJ in question got a radio job in the US I believe and that’s when it was passed over to Froggy to road test, he thought it was fantastic apart from the fact it did not have a cross fader, so Mat added a cross fader and he told me at the time it was the first cross fader that did not dip in sound in the middle.
Still have my one and in my opinion unless you are spending a fair amount of money this still tops many around now.
Keith
1 Like
Oh I did bid for the Newmark BCM 125 on Ebay last night I bid above everyone else when there was 1 minute and 15 seconds to go but still I was outbid.
Keith
Ahhh. I’m so sorry. I was looking at it most of the night hoping you was the lead bidder. It’s a shame someone popped you to it but they’ll be another appear at some point.
I had a look at that Matamp Supernova and it looks great for the time. I found some great info online.
Johnny Morris (Showstoppers)?
Apparently Emperor Rosko was a user too.
WOW! I have found my people. I’ve been going down a lonely rabbit hole the last few months about this topic.
I started in 2002 with a Behringer Beatcounter BC100, a wrist watch. Marked the records sleeves with sharpie, and made a spreadsheet like @DJKeith. Printed it out, had a little binder.
Then I got Serato SL-1 in 2004 and haven’t thought of this problem for two decades, until 6 months ago when I started working on a computer-less DJ project that requires a fast, precise BPM detector (hardware only) .
My first purchase was Red Sound Micro, but realized I needed multiple inputs. Then I got the Numark Beatkeeper. @CBR1 it’s awesome to meet you! Elliot and you were WAY ahead of the game wow. I bought the Numark 1235 to complete the set, but should have got the Numark PPD DM-1835X instead.
Dang, I wish you would have been able to release that MIDI output version!
That’s what led me to the Red Sound Voyager 1, which is OK but very frustrating in some ways. You cant manually set the tempe. If you nudge the detected tempo too much, it freaks out. You cant lock the tempo, and sometimes it just jumps to some other BPM, so you cant really trust it with you MIDI clock unless its like really consistent straight forward 4x4 house
I did get the Soundbyte Pro, which is cool as an automatic loop grabber, but doesnt send or receive MIDI and theres no bypass/thru except for the headphone jack, which is makes it hard to use live .
Damn @PKtheDJ I have been searching for a Red Sound Micro forever. Is it reliable?
Then I got the Pioneer EFX-500, but it doesnt have a way to set the downbeet, like you can on the Voyager. I then went down the MIDI Clock path. Started with Disaster Area SMARTClock Gen3 then leveled up to ERM Multiclock because it can generate MIDI clock via 1/8" Audio Input. Then discovered it only works with special sample provided with 24 notes per beat =24ppq, and not just any audio like all the Numark or Red Sound BPM detectors
My regular DJ gear Rane 70, Pioneer S9, Pioneer 900 have BPM detection obviously, but I’m jumping from one audio input source to another quickly, and I’m not playing simple 4x4 electronic dance music, so they’re basically useless.
I heard Denons were better, so I got a Denon 1600. I wanted more MIDI flexibility than the newer releases, and I absolutely LOVE the matrix input knobs at the top. Every mixer should have that.
But it would measure 1 channel at a time, and I heard the 1850 measured all 4 channels simultaneously, so I got that, and actually love it as a DJ mixer for my regular club DJ gigs, but for this specific project, it hasnt solved the problem either. I can’t figure out how to get it to “forget” the most recent Auto BPM when I jump to different iput, and so far I havent been able to work out how to access the simulataneous BPMs of multiple channels, but maybe you need an external media player to access that. It also lost the matrix input knobs from the 1600 and why why why are still putting Send/Receive in the FX panel, which means you’ve lost all the internal FX.
Sorry this is a long post, but I’ve been in the struggle for like 6 months and no one else seems to really care about this topic. I basically gave up, and out of curiosity checked all the iPhone Apps, which have a few good options. BPM Detector is solid. Another one called BPM Detect is OK, interface kinda janky, but it does have Ableton Link.
Then I found AutoBPM and that changed everything. Not only is it the fastest most reliable BPM detection I’ve found ever - like almost better than Serato - but I messaged the developer to send my compliments, and he asked if I had any suggestions on how to improve, and I half jokingly said offer a MIDI Clock out, and then a week later he told me up update on the App store and he did it! Then I suggested an optoin for direct audio input instead of mic and he added that. We’ve done 9 updates in the last month with differest stuff that been annoying me about every other device I’ve tried in the last 6 months. Heaven sent.
But it doesnt solve my no-computers problem. Anyone have any suggestions? I really dont want to buy this MasterSounds FX overpriced thing
It’s pretty good considering what it is. The level going in has to be just right, and if the reading is off then you might need to increase/decrease the level to help things along.
Auto BPM user here 
Great app.
Where does the Mastersounds FX unit fit in here? I got a bit lost trying to work that part out.
19:53 → https://youtu.be/Obn21GL68uQ?si=T1OwzXmBWUeRLSm9&t=1194
Half joking, because I’m pretty sure there’s no way to sync the internal Auto-BPM info to another device, but the reason I bring it up is because (1) its basically the only modern non-computer device that presents its Auto-BPM as a distinguishing feature. They’re acting like the Auto-BPM is really fast, and precise, which no one else cares about enough to even mention really. Then in that one clip about, it does appear to grab the tempo of an analog input source pretty damn fast. But that’s the only info I have about it, and honestly I am no the target demo for this kinda of expensive audio snobbery, except for the the Auto BPM
If there’s any features you’d like to see added to Auto-BPM let me know. We’re about to add a downbeat marker and some other stuff.