diff --git a/package-lock.json b/package-lock.json
index 4ea3035b..d53d5302 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,27 +1,27 @@
 {
   "name": "scale-workshop",
-  "version": "3.0.0-beta.24",
+  "version": "3.0.0-beta.25",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "scale-workshop",
-      "version": "3.0.0-beta.24",
+      "version": "3.0.0-beta.25",
       "dependencies": {
         "isomorphic-qwerty": "^0.0.2",
         "ji-lattice": "^0.0.3",
         "jszip": "^3.10.1",
-        "moment-of-symmetry": "^0.4.2",
+        "moment-of-symmetry": "^0.5.2",
         "pinia": "^2.1.7",
         "qs": "^6.12.0",
-        "sonic-weave": "github:xenharmonic-devs/sonic-weave#v0.0.34",
+        "sonic-weave": "github:xenharmonic-devs/sonic-weave#v0.0.36",
         "sw-synth": "^0.1.0",
         "temperaments": "^0.5.3",
         "values.js": "^2.1.1",
         "vue": "^3.3.4",
         "vue-router": "^4.3.0",
         "webmidi": "^3.1.8",
-        "xen-dev-utils": "^0.6.1",
+        "xen-dev-utils": "^0.7.0",
         "xen-midi": "^0.2.0"
       },
       "devDependencies": {
@@ -4381,23 +4381,11 @@
       }
     },
     "node_modules/moment-of-symmetry": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/moment-of-symmetry/-/moment-of-symmetry-0.4.2.tgz",
-      "integrity": "sha512-XBzU01kDgQfN0JacGSwMOxJOk5EhwcaojbDQDDdZF/k16ze/VP9X8Cz1Gy8Hmhg+WMu0axfTVP4ufzhoFt0C4g==",
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/moment-of-symmetry/-/moment-of-symmetry-0.5.2.tgz",
+      "integrity": "sha512-omlRHnafyz5ZUfGIy64ISkX2XZsoRq//lFvZ+96zVFVveHrCPrVSKVva4pLBHZeesQrIYxTe7A1Ij6fRQwtffg==",
       "dependencies": {
-        "xen-dev-utils": "^0.2.8"
-      },
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/frostburn"
-      }
-    },
-    "node_modules/moment-of-symmetry/node_modules/xen-dev-utils": {
-      "version": "0.2.9",
-      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.2.9.tgz",
-      "integrity": "sha512-ngs85djTa5MH9yMomyFg1ZK1eETgtaG6FN5ZvDazyBbGmShuK/gOEWGRemHqm+I2zp3lOGbXlEU/M4SwYl3HLA==",
-      "engines": {
-        "node": ">=10.6.0"
+        "xen-dev-utils": "^0.7.0"
       },
       "funding": {
         "type": "github",
@@ -5467,12 +5455,12 @@
       }
     },
     "node_modules/sonic-weave": {
-      "version": "0.0.34",
-      "resolved": "git+ssh://git@github.com/xenharmonic-devs/sonic-weave.git#d6e4b4f81bf7e2dfa0efccd154d04fad1e26c7b9",
+      "version": "0.0.36",
+      "resolved": "git+ssh://git@github.com/xenharmonic-devs/sonic-weave.git#4e120d3bfed93cf0971c90260dd71f0852f78143",
       "license": "MIT",
       "dependencies": {
-        "moment-of-symmetry": "^0.4.2",
-        "xen-dev-utils": "^0.6.1"
+        "moment-of-symmetry": "^0.5.2",
+        "xen-dev-utils": "^0.7.0"
       },
       "bin": {
         "sonic-weave": "bin/sonic-weave.js"
@@ -6616,9 +6604,9 @@
       }
     },
     "node_modules/xen-dev-utils": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.6.1.tgz",
-      "integrity": "sha512-smdLvCIYnAuwGiVdj67kW8kS37gwtUFBF253ukTa4V7BfVglt7HYR9r1EQTCB8FC1J8rdNY++M8TRID+YNsH4A==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.7.0.tgz",
+      "integrity": "sha512-KECBCnnHD9sh4lY0Q6+KcgKVwMBWUOGjEJ/7S8sER2L3BKciy9kLhPFB+LR3z1oQiNS/OI7lv3L4rtPEX5SPUQ==",
       "engines": {
         "node": ">=10.6.0"
       },
diff --git a/package.json b/package.json
index 701f4cbd..6891b5fe 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "scale-workshop",
-  "version": "3.0.0-beta.24",
+  "version": "3.0.0-beta.25",
   "scripts": {
     "dev": "vite",
     "build": "run-p type-check \"build-only {@}\" --",
@@ -18,17 +18,17 @@
     "isomorphic-qwerty": "^0.0.2",
     "ji-lattice": "^0.0.3",
     "jszip": "^3.10.1",
-    "moment-of-symmetry": "^0.4.2",
+    "moment-of-symmetry": "^0.5.2",
     "pinia": "^2.1.7",
     "qs": "^6.12.0",
-    "sonic-weave": "github:xenharmonic-devs/sonic-weave#v0.0.34",
+    "sonic-weave": "github:xenharmonic-devs/sonic-weave#v0.0.36",
     "sw-synth": "^0.1.0",
     "temperaments": "^0.5.3",
     "values.js": "^2.1.1",
     "vue": "^3.3.4",
     "vue-router": "^4.3.0",
     "webmidi": "^3.1.8",
-    "xen-dev-utils": "^0.6.1",
+    "xen-dev-utils": "^0.7.0",
     "xen-midi": "^0.2.0"
   },
   "devDependencies": {
diff --git a/src/character-palette.json b/src/character-palette.json
index 64bded43..c8bb01aa 100644
--- a/src/character-palette.json
+++ b/src/character-palette.json
@@ -27,9 +27,11 @@
   "ε": "Interordinal nominal epsilon. <code>ε4</code> is a semioctave above <code>E4</code>.",
   "ζ": "Interordinal nominal zeta. <code>ζ4</code> is a semioctave above <code>F4</code>.",
   "η": "Interordinal nominal eta. <code>η4</code> is a semioctave below <code>G4</code>.",
+  "φ": "Interordinal nominal phi. <code>φ4</code> is a semifourth above <code>C4</code>.",
+  "χ": "Interordinal nominal chi. <code>χ4</code> is 9/8 above <code>φ4</code>.",
+  "ψ": "Interordinal nominal psi. <code>ψ4</code> is a semifourth below <code>C5</code>.",
+  "ω": "Interordinal nominal omega. <code>ω4</code> is 9/8 above <code>ψ4</code>.",
   "¢": "Cent. <code>1¢</code> is equal to <code>1\\1200</code>.",
-  "€": "Reciprocal cent. <code>€ · 1¢</code> is <code>1</code>.",
-  "¶": "Geometric inverse of the Hertz. <code>¶ · 1Hz</code> is <code>1</code>.",
   "µ": "Metric prefix micro. E.g. Period of oscillation <code>2000 µs</code> corresponds to frequency of oscillation <code>500 Hz</code>.",
   "⟨": "Val angle bracket. <code>⟨12 19 28]</code>.",
   "⟩": "Monzo angle bracket. <code>[-4 4 -1⟩</code>."
diff --git a/src/stores/tempering.ts b/src/stores/tempering.ts
index e17e48ba..aab9f291 100644
--- a/src/stores/tempering.ts
+++ b/src/stores/tempering.ts
@@ -160,9 +160,13 @@ export const useRank2Store = defineStore('rank2', () => {
   const subgroupString = state.subgroupString
 
   // === Computed state ===
-  const generatorPerPeriod = computed(
-    () => generator.value.totalCents() / period.value.totalCents()
-  )
+  const generatorPerPeriod = computed(() => {
+    const p = period.value.totalCents()
+    if (!p) {
+      return 0;
+    }
+    return generator.value.totalCents() / p
+  })
   const safeNumPeriods = computed(() => {
     const value = Math.abs(parseInt(numPeriods.value as unknown as string, 10))
     if (isNaN(value)) {
@@ -170,9 +174,7 @@ export const useRank2Store = defineStore('rank2', () => {
     }
     return value || 1
   })
-  const opposite = computed(() =>
-    isBright(generatorPerPeriod.value, safeSize.value / safeNumPeriods.value) ? 'dark' : 'bright'
-  )
+  const opposite = computed(() => isBright(generatorPerPeriod.value, safeSize.value / safeNumPeriods.value) ? 'dark' : 'bright')
 
   const [mosPatterns, mosPatternsError] = computedAndError(() => {
     if (method.value === 'generator') {
@@ -219,19 +221,27 @@ export const useRank2Store = defineStore('rank2', () => {
   }, [])
 
   const circlePeriodCents = computed(() => {
+    const p = period.value.totalCents()
+    if (!p || isNaN(p)) {
+      return 0.0001;
+    }
     const stretch = parseFloat(periodStretch.value)
     if (isNaN(stretch)) {
-      return period.value.totalCents()
+      return p
     }
-    return period.value.totalCents() * Math.exp(stretch)
+    return p * Math.exp(stretch)
   })
 
   const circleGeneratorCents = computed(() => {
+    const g = generator.value.totalCents()
+    if (isNaN(g)) {
+      return 0;
+    }
     const fine = parseFloat(generatorFineCents.value)
     if (isNaN(fine)) {
-      return generator.value.totalCents()
+      return g
     }
-    return generator.value.totalCents() + fine
+    return g + fine
   })
 
   const safeSize = computed(