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I've just discovered the really handy mpd (music player daemon) which is pretty much the perfect command-line geek's music player service. No graphical interface, no nothing.

Anyway

It's currently playing my MP3s on shuffle and it's great, but the MP3s are a bit too varied in their volume: some are too loud, some are too quiet. And this is where the magic of ReplayGain comes in. ReplayGain is a hint that can get embedded in an MP3 about how loud it should be, and there's a linux command called "mp3gain" that can analyse your files for you and make sure they're all equalised volumewise. If you have a folder containing ten MP3s from an album, you can run a command like

   mp3gain ~/Music/theAforementionedAlbum/*.mp3

and it'll do the business. The extra-clever bit is that it also applies album-wise ReplayGain - assuming that all the files you've given it are off the same album, which has been carefully mixed to have loud bits and quiet bits, it'll specify an albumwise level as well as an individual trackwise level.

So far so good, but what if you have a million albums of a billion MP3s? You'd need to run that command once for each album.

Or you could do some command-line kung-fu. This command is what's running on my linux box right now (should work on mac too):

   find -L ~/Music/ -name "*.mp3" -exec dirname "{}" \; | uniq | while read line; do mp3gain -k -o -r "$line"/*.mp3; done

It uses find to find all my MP3s, dirname to find which folder they're in, uniq to make that a unique list of folders, then while read line to feed that info one line at a time to the mp3gain command. Therefore it's feeding it with one folderfull at a time, rather than just one MP3-file at a time, which should allow it to do the ReplayGain thing best.

Plum ketchup is a great autumn recipe. I'm publishing it now (spring) cos I made up a big batch of plum ketchup to make christmas presents this year - and I think it went down pretty well... I think it's well nice, at least! Goes especially well on sausages or fish.

• 1 tsp black peppercorns
• 6 whole cloves
• 1 bay leaf (optional... we didn't have any)
• 1/2 tsp cinnamon or 2cm cinnamon stick
• 4 medium tomatoes, chopped coarsely
• 8 plums, chopped coarsely (without stones)
• 2 medium white onions
• 1/2 cup red wine vinegar
• 1 cup sugar
• 2 tsp salt
• 1 tbsp tomato paste

Put tomatoes, plums and onions in a large saucepan with the spices. Bring to the boil and simmer gently for 45 minutes or until the onion is soft. (Don't be tempted to add water, the fruit+veg will start to produce enough liquid after a few minutes.)

Cool the mixture for 10 minutes, then blend or process it until smooth. (Some would remove the spices before blending but I don't.) Then strain through a sieve back into the pan.

Add remaining ingredients, stir over a gentle heat (do not boil) until the sugar dissolves. Simmer uncovered until the mixture thickens to the right consistency (about 15 minutes, stirring occasionally).

Pour the hot ketchup into hot sterilised bottles or jars, and seal while hot.

(This is based on a standard tomato ketchup recipe, but with half the tomatoes replaced by plums, and some cinnamon added to complement the plum flavour.)

Puredyne is a linux distro specialised for real-time audio+video art. It's also a live distro, meaning it boots straight off a USB stick or CD - so you can use it without trashing your current mac/windows/linux install, or plug it in when you turn up at some random university computer room or whatever. How cool is that?

The latest version of puredyne is now out - puredyne 9.10 (carrot&coriander), released Jan 16th 2010. It's based on the latest ubuntu, with a real-time kernel, a streamlined graphical interface and loads of software for realtime video and audio processing. There's SuperCollider, PureData, Fluxus, Processing, Ardour, Mixxx, Chuck, Csound, Icecast... all built right in.

I've been helping the GOTO10 team put this release together and I'm well happy with it, I've always wanted a distro like this (yes I've tried other media distros, Ubuntu Studio, 64 Studio etc). It runs great on my tiny little Eee.

One of the programs I discovered during this is Mixxx which is a free live DJing tool. It's really nice - does a lot of the stuff I've seen in commercial DJ software like tempo-detection, time-stretching/vinyl emulation, and working with timecode vinyl. You point it at your MP3 collection and straight away you're ready to rock the party. You can push the sound through Jack effects etc etc. Nice.

Of course the main thing for me is SuperCollider which works really nicely from vim or emacs or gedit. I'm setting it up right now with all my extra bits of code and things, hopefully this is gonna be my distro for live performances - it's by far the best candidate for livecoding etc on my Eee. Get puredyne from here and see what you think.

On the radio this morning one of the guests was asked, "Apart from changing your light-bulbs, what have you personally done about climate change?" and they said "Well it's complex, I don't know all the facts, so... well we've changed our light-bulbs, but..." [done nothing else].

That's a pathetic excuse. You do not need to know the details.

Almost no-one claims to understand the details of international finance, but we still reckon we know what should be done about bonuses, and we make decisions about which bank to put our money in. But the vested interests in the climate debate seem to be succeeding in making things seem too complex for us mere mortals to understand or do anything about.

But it's really easy to know what to do, and you don't need to follow the ins-and-outs. Here's what to do:

• Avoid international flights
• Insulate your home, and get a new boiler if yours is ancient
• Use public transport more often instead of the car
• Try and choose food that's local and in-season

There's acres of detail available if you want to read more detail, e.g. some tips from New Scientist and this excellent free book about energy but the basic advice is as simple and boring and unchanging as the above stuff.

As an academic researcher I've hated having to avoid international flights. There have been some brilliant opportunities popped up over the past year, to go and do some research visits or go to international conferences - and I've taken up some of them, but some of them I've let slip specifically because of all the international flying that would be involved. And that's my loss. Just like it's a loss to not have the freedom to go flying off on holiday every year, or to have energy-saving lightbulbs that still take a few seconds to warm up to their full brightness which is a hassle.

You can see how it adds up in our brains. Hassle + complex = ignore it for now, maybe think about it later. That's a natural reaction. But the complexity is irrelevant, because we can all do these things we need to, so we need to try.

There's a big change happening in UK science+engineering at the moment, and it goes by the name of Impact. What does it mean? When we do science we often do it just to find new things out, yet whether we intend it or not one of the great things about science is that it actually makes important changes to the world outside our research group. Impact is formally defined as being that effect that we have - on business and economy, on health, on public policy, on culture and the arts. There are billions of ways that impact spreads.

This has always been a very unpredictable thing and pretty hard to measure, so the government now has created a formal process for trying to account for the types of impact that we get out of research - and even further, to think hard about impact when deciding what research to fund. In a lot of cases the predicted impact will now account for up to 25% of the considerations in rating academic departments or allocating funding.

Sounds reasonable? Well many scientists are against it - and it's not because they don't like having to justify themselves (they already have to do that when they write grant applications etc), but because the real impact of science often happens in surprising ways, sometimes many years down the line. Take DNA fingerprinting for example. The scientists who came up with it were working with DNA, trying to measure various things, but they had no idea that the best thing they could do was make an unruly collection of DNA form patterns on a sheet of film - they discovered it by accident. And now it's an important part of many of the most serious court cases we have. Think of all the people who were convicted or freed based on DNA evidence - that's some serious impact there.

There are lots more examples of unpredictable impact - such as:

• Email, when it was invented, was only able to send messages to people using the same mainframe. No-one predicted that tweaking it to send messages around the world would make it one of the most important communication tools we have.
• Gregor Mendel - a lone priest planting peas in a garden, trying out different cross-breeds and making careful notes. It wasn't until years after his death that biologists realised how Mendel's laws of inheritance fit with Darwinian evolution, and formed the foundation of modern biology, with massive impact throughout society.
• Texting. A phone is for phoning, right? Text messages were never planned to be the mainstay of what mobile phones were about, just a way to get a message through when you couldn't talk. But now many people text more than they call.
• Liquid crystal displays eventually arose from the basically curiosity-driven research of Friedrich Reinitzer looking at the chemical cholesteryl benzoate. Now it's used in TVs, phones, watches...
• Fibre optics was demonstrated as a curiosity and a demonstration of physical principles in the 19th century; but it wasn't until way into the 20th century that it became important for data transmission, for example in phone networks.

And the opposite is also true - history is littered with examples of discoveries/inventions that were widely expected to change the world, but didn't:

• Video messaging: the phone companies seem to have thought that if we liked text messaging we were going to love video messaging. No.
• Artificial intelligence: In the 1960s the artificial intelligence research community was an incredibly optimistic one, with leading lights such as Marvin Minsky basically thinking they would be able to recreate the intelligence of a whole human brain within a few years, and then we'd all be having conversations with robot pals. That optimism came crashing down. Sure, you can now buy robot pals, and sure, we're still researching artificial intelligence and indeed using it in various applications, but it hasn't yet been the revolutionary impact it was going to be.
• Hovercrafts and maglev: these have become the clichés of misplaced futurology. After their invention they seemed to have been poised to take over the world - but no, we're still mostly using the good old wheel to get around.

So with all this evidence, it's not surprising that scientists are worried about this new approach of trying to plan your impact - much of the curiosity-driven stuff that has real impact could well get sidelined in favour of things which might be a bit less imaginitive but which seem like they'll definitely make some public or business connection.

OK fine - seems like there's some misguided bureaucracy coming down from government, and we have to try and make sure it doesn't end up stifling what it's supposed to be helping. But there's a bigger question that maybe we can think about. As I've said, "impact" is very hard to pin down or predict, and we don't really know how predictable it could or should be. But in many grant applications and suchlike, scientists are now writing down their predictions about the impact they'll have. Are those predictions useful data? Could we use "impact plans" as a great big study about whether impact can be predictable?

We could for example wait for five years, then look back at the pile of impact plans and ask, how many of those predictions (the ones which got funded, at least) came true? What percentage? What proportion of the observable scientific+engineering impact made over the next five years will have been predicted, in writing, in advance?

It would still leave a million questions unanswered, especially about unidentifiable impact (subtle things which are hard to count), long-term impact, and really it would still be a very reductive way to think about how science affects our society. But I wonder... would that make all these "impact statements" worth their while?